tools(rpo-replay): v4 WIP — data-driven model from public element sets, true time-lapse engine with motion blur, timeline, label hysteresis

Co-Authored-By: Claude Opus 5.5 <[email protected]> Claude-Session: https://claude.ai/code/session_0187rSCa4AKJPGw6uiuPSGyX
2026-11-08 12:23:59 +00:00 · 2026-11-08 05:21:12 +00:00
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truncated
@@ -0,0 +1 @@
+{"t0":"2026-09-29T12:00:00Z","dt":60,"a_km":6920.86656753336,"x36":[-3625.5189,-5318.3928,2553.1804,-3766.6429,-5406.7449,2129.5637,-3891.4855,-5471.7261,1696.7165,-3999.5064,-5513.0548,1256.5148,-4090.2389,-5530.5527,810.8666,-4163.2919,-5524.1455,361.704,-4218.3513,-5493.863,-89.0263,-4255.1815,-5439.8394,-539.3709,-4273.6267,-5362.3124,-987.3787,-4273.6112,-5261.6219,-1431.1097,-4255.1399,-5138.2088,-1868.6435,-4218.2979,-4992.6125,-2298.0876,-4163.2501,-4825.4685,-2717.5863,-4090.2405,-4637.5056,-3125.3281,-3999.5906,-4429.5422,-3519.5541,-3891.6983,-4202.4827,-3898.5655,-3767.0355,-3957.3135,-4260.7306,-3626.1461,-3695.098,-4604.4922,-3469.6435,-3416.9724,-4928.3736,-3298.2077,-3124.1403,-5230.9851,-3112.5823,-2817.8673,-5511.0297,-2913.5708,-2499.4756,-5767.3082,-2702.0336,-2170.3385,-5998.7243,-2478.884,-1831.874,-6204.2888,-2245.084,-1485.5388,-6383.1236,-2001.6406,-1132.8228,-6534.465,-1749.6012,-775.2418,-6657.667,-1490.0494,-414.3321,-6752.2034,-1224.1004,-51.6435,-6817.6704,-952.8961,311.2668,-6853.7876,-677.601,672.8408,-6860.3993,-399.3967,1031.526,-6837.4753,-119.4774,1385.782,-6785.1109,160.9549,1734.0865,-6703.5265,440.6958,2074.9421,-6593.067,718.5431,2406.882,-6454.2004,993.3019,2728.4768,-6287.5159,1263.7898,3038.3397,-6093.7221,1528.8414,3335.1331,-5873.6438,1787.3137,3617.5742,-5628.2193,2038.0909,3884.4401,-5358.4963,2280.089,4134.5737,-5065.628,2512.2606,4366.8886,-4750.8684,2733.5996,4580.374,-4415.5673,2943.1456,4774.0993,-4061.1646,3139.9881,4947.2182,-3689.1846,3323.2708,5098.9729,-3301.2294,3492.1953,5228.6976,-2898.9722,3646.0251,5335.8216,-2484.1499,3784.0885,5419.8722,-2058.5561,3905.7822,5480.4768,-1624.0326,4010.5739,5517.3649,-1182.4621,4098.0049,5530.3699,-735.7589,4167.6921,5519.4291,-285.8613,4219.3301,5484.5851,165.2776,4252.6923,5425.985,615.6986,4267.6325,5343.8803,1063.4451,4264.0848,5238.6252,1506.572,4242.0646,5110.6759,1943.1542,4201.6682,4960.5876,2371.2956,4143.0722,4789.0125,2789.1375,4066.533,4596.6966,3194.8666,3972.3851,4384.4763,3586.7233,3861.0399,4153.2748,3963.0095,3732.9835,3904.0971,4322.0959,3588.7745,3638.0265,4662.4289,3429.0413,3356.2186,4982.5378,3254.4793,3059.8969,5281.0405,3065.8479,2750.347,5556.6496,2863.9667,2428.9108,5808.1779,2649.7119,2096.9807,6034.543,2424.0126,1755.9934,6234.7722,2187.8466,1407.424,6408.0057,1942.2361,1052.779,6553.5008,1688.2435,693.5905,6670.6345,1426.9663,331.4093,6758.906,1159.5332,-32.2016,6817.9385,887.0984,-395.6736,6847.4811,610.8377,-757.4391,6847.4092,331.9425,-1115.938,6817.7252,51.6159,-1469.6244,6758.5586,-228.9334,-1816.9732,6670.1653,-508.4954,-2156.4859,6552.9263,-785.8643,-2486.6979,6407.3469,-1059.8435,-2806.1839,6234.0537,-1329.2506,-3113.5641,6033.7929,-1592.9226,-3407.5106,5807.4269,-1849.7206,-3686.7526,5555.9306,-2098.535,-3950.0821,5280.3881,-2338.2901,-4196.3592,4981.9873,-2567.9488,-4424.5171,4662.0157,-2786.5173,-4633.5668,4321.8548,-2993.0494,-4822.6018,3962.9741,-3186.6507,-4990.8017,3586.925,-3366.4824,-5137.4364,3195.3341,-3531.7656,-5261.8692,2789.8963,-3681.7841,-5363.5598,2372.3671,-3815.8884,-5442.0668,1944.5552,-3933.498,-5497.0496,1508.3147,-4034.1043,-5528.2705,1065.5362,-4117.273,-5535.5952,618.1391,-4182.6458,-5518.9936,168.063,-4229.9422,-5478.5403,-282.7416,-4258.9606,-5414.4137,-732.321,-4269.5793,-5326.8954,-1178.7281,-4261.7566,-5216.369,-1620.03,-4235.5314,-5083.318,-2054.3173,-4191.0225,-4928.3236,-2479.7125,-4128.4281,-4752.0621,-2894.3776,-4048.0249,-4555.3015,-3296.5229,-3950.1663,-4338.8981,-3684.4144,-3835.2812,-4103.7925,-4056.3812,-3703.8716,-3851.0055,-4410.8229,-3556.5102,-3581.633,-4746.216,-3393.8381,-3296.8416,-5061.1204,-3216.5615,-2997.8631,-5354.1857,-3025.4486,-2685.989,-5624.1563,-2821.3264,-2362.5652,-5869.8766,-2605.0768,-2028.9858,-6090.2958,-2377.6327,-1686.6876,-6284.472,-2139.9745,-1337.1435,-6451.5758,-1893.1251,-981.8563,-6590.8939,-1638.1463,-622.3528,-6701.8315,-1376.134,-260.1771,-6783.9148,-1108.2137,103.1156,-6836.7927,-835.5356,465.9655,-6860.2385,-559.2705,826.815,-6854.1503,-280.6041,1184.1145,-6818.552,-0.7327,1536.3291,-6753.5926,279.1418,1881.9451,-6659.5462,557.817,2219.4761,-6536.8107,834.095,2547.4691,-6385.9067,1106.7874,2864.5109,-6207.4749,1374.7199,3169.2339,-6002.2742,1636.738,3460.3218,-5771.1787,1891.7111,3736.5156,-5515.1741,2138.5378,3996.6187,-5235.3541,2376.1508,4239.5027,-4932.9158,2603.521,4464.1117,-4609.155,2819.6626,4669.4677,-4265.461,3023.6373,4854.6748,-3903.3108,3214.5582,5018.9232,-3524.2629,3391.5945,5161.4933,-3129.9508,3553.9745,5281.7589,-2722.076,3700.9899,5379.1903,-2302.4007,3831.9985,5453.3567,-1872.7403,3946.4277,5503.9286,-1434.9551,4043.7766,5530.6795,-990.9423,4123.6191,5533.4868,-542.6278,4185.6053,5512.3327,-91.9572,4229.4634,5467.3044,359.1127,4255.0011,5398.5938,808.6228,4262.1061,5306.4965,1254.6202,4250.7472,5191.4108,1695.1675,4220.9739,5053.8358,2128.3511,4172.9164,4894.3688,2552.2897,4106.785,4713.7032,2965.1433,4022.8689,4512.6245,3365.1207,3921.5348,4292.0072,3750.4879,3803.2253,4052.811,4Line truncated
@@ -1,72 +1,62 @@
-// HUD for the RPO replay, sized for phone playback: a 16:9 video in a feed
-// plays ~390 px wide (≈0.2×), so body copy is ≥34 px at 1080p and nothing
-// that must be read is under ~24 px. Every animation is a pure function of
-// the video time `s`, so frames render deterministically.
+// HUD for the RPO replay (v4), sized for phone playback: a 16:9 video in a
+// feed plays ~390 px wide (≈0.2×), so body copy is ≥34 px at 1080p and nothing
+// that must be read is under ~24 px. Animation is a function of video time `s`,
+// except label placement, which carries state between consecutive frames so
+// labels hold their side (hysteresis) and ease instead of jumping.

 export function createHud(ctx) {
-  const { D, W, H, U, PORTRAIT, sec, rate, sOfTau, sepAt, CA_T, VANTOR_T, BURNS, CUTS, project } = ctx;
+  const { D, W, H, U, PORTRAIT, sec, rate, sOfTau, CA_T, VANTOR_T, BURNS, CUTS, SHOTS, shotAt, DUR, project } = ctx;
  const $ = (q) => document.querySelector(q);
  const CA_M = Math.round(D.ca.m / 5) * 5;
+  const END = SHOTS.find((x) => x.id === 'end').s0;

  // -------------------------------------------------------------------------
  // Story
  // -------------------------------------------------------------------------
+  const span = (id) => {
+    const x = SHOTS.find((sh) => sh.id === id);
+    return [x.s0, x.s1];
+  };
  const CHAPTERS = [
-    { key: 'climb', label: 'Climb', s0: 4.4, s1: 12.5 },
-    { key: 'drop', label: 'Drop in', s0: 12.5, s1: 22.0 },
-    { key: 'close', label: 'Close in', s0: 22.0, s1: 29.7 },
-    { key: 'closest', label: 'Closest', s0: 29.7, s1: 35.6 },
-    { key: 'leave', label: 'Leave', s0: 35.6, s1: 41.2 },
+    { key: 'climb', label: 'Climb', s0: span('climb')[0], s1: span('lap')[1] },
+    { key: 'drop', label: 'Drop in', s0: span('drop')[0], s1: span('close')[1] },
+    { key: 'dance', label: 'Close in', s0: span('dance')[0], s1: span('approach')[1] },
+    { key: 'closest', label: 'Closest', s0: span('ca')[0], s1: span('sunrise')[1] },
+    { key: 'leave', label: 'Leave', s0: span('leave')[0], s1: span('leave')[1] },
  ];
+  const cap = (id, title, body, extra = {}) => ({ s0: span(id)[0], s1: span(id)[1], title, body, ...extra });
  const CAPTIONS = [
-    {
-      s0: -1, s1: 4.4, hook: true,
-      title: `A Russian military satellite shadowed a U.S.-registered one — to <span class="c-cos" style="white-space:nowrap">~${CA_M} m</span>`,
-      body: 'How <b class="c-cos">Cosmos 2612</b> matched <b class="c-x36">ICEYE-X36</b>\'s orbit over 22 days, rebuilt from public tracking data.',
-    },
-    {
-      s0: 4.4, s1: 12.5,
-      title: 'Climb higher to fall behind',
-      body: 'A higher orbit is slower. Lifted <b>47 km</b>, it drifts back and laps its target.',
-    },
-    {
-      s0: 12.5, s1: 17.2,
-      title: 'Drop into the same orbit',
-      body: 'Oct 12: it dives 47 km and lands about <b>480 km behind</b>.',
-    },
-    {
-      s0: 17.2, s1: 22.0,
-      title: 'Speed up, then brake',
-      body: 'Oct 15: a 2 km dip makes it faster — closing <b>~350 km a day</b> — then it brakes 3 km behind.',
-    },
-    {
-      s0: 22.0, s1: 29.7,
-      title: 'Park behind it. Creep closer.',
-      body: 'Each orbit its path loops <b>1.6 km</b>, inching in for two days.',
-    },
-    {
-      s0: 29.7, s1: 32.3,
-      title: 'Into Earth\'s shadow',
-      body: 'Closing at strolling pace (<b>0.9 m/s</b>) — while both fly at 27,000 km/h.',
-    },
-    {
-      s0: 32.3, s1: 35.6,
-      title: `Closest pass: <span class="c-cos">~${CA_M} m</span>`,
-      body: 'Shown at true size. Published estimates: <b>150–650 m</b>.',
-    },
-    {
-      s0: 35.6, s1: 41.2,
-      title: 'Back off — and wait',
-      body: 'It burns away. Today it sits <b>480 km behind</b>, in the same orbit.',
-    },
+    cap('hook', `A Russian military satellite came within <span class="c-cos nw">~${CA_M} m</span> of a U.S.-registered one`,
+      'This is how it got there, rebuilt from public tracking data.', { hook: true, s0: -1 }),
+    cap('climb', 'Climb higher to fall behind',
+      'Same orbit, a quarter-orbit apart. Two burns lift <b class="c-cos">Cosmos 2612</b> <b>47 km</b>, and a higher orbit is a slower one.'),
+    cap('lap', 'Fall behind, and lap it',
+      'Drifting back <b>~6,700 km a day</b>, it laps almost twice, passing over <b class="c-x36">X36</b> on Oct 5 and Oct 12, as its orbit plane swings into line.'),
+    cap('drop', 'Drop into the same orbit',
+      'Oct 12: from <b>47 km</b> directly overhead it dives into X36\'s orbit, and lands about <b>480 km behind</b>.'),
+    cap('close', 'Speed up, then brake',
+      'A 2 km dip makes it faster, closing <b>~350 km a day</b>. Then it brakes 3 km behind.'),
+    cap('dance', 'The dance',
+      'Every orbit is a day and a night. Each one, Cosmos loops <b>~1.5 km</b> around X36, 3 km behind it.'),
+    cap('dance-ff', 'Flatten the loops',
+      'A tiny burn puts Cosmos almost exactly in X36\'s path. It creeps in <b>~3 km a day</b>.'),
+    cap('approach', 'Closing in, slowly',
+      'Creeping in at <b>a few centimetres per second</b>, while both fly at <b>27,000 km/h</b>.'),
+    cap('ca', `Closest pass: <span class="c-cos nw">~${CA_M} m</span>`,
+      'True size. LeoLabs measured <b>~500 m</b>; other estimates run <b>150 to 650 m</b>.'),
+    cap('sunrise', 'Then the sun comes up',
+      'Twenty minutes later both leave Earth\'s shadow. Within hours, Cosmos backs away.'),
+    cap('leave', 'Back off, and wait',
+      'It drifts back <b>~350 km a day</b>. By Oct 25 it sat <b>~480 km behind</b>, in the same orbit.'),
  ];
  const BURN_NOTES = {
    'Phasing raise': 'raises its orbit 46 km',
    'Plane trim': 'tilts its orbit into line',
-    'Descent to X36 orbit': 'drops 47 km',
+    'Descent to X36 orbit': 'drops 47 km into X36\'s orbit',
    'Closing burn': 'dips 2.3 km to speed up',
    'Braking burn': 'rises 2.5 km to stop',
-    'Back-off': 'rises 130 m',
+    'Back-off': 'rises 140 m and starts to drift back',
+    'Ellipse trim': 'flattens its loops',
    'Departure burn': 'rises 2.4 km to drift away',
    'Re-match orbit': 'drops 2.6 km to hold position',
  };
@@ -75,11 +65,12 @@ export function createHud(ctx) {
      t: b.t, kind: 'burn', title: 'Engine burn',
      sub: `${BURN_NOTES[b.label] || b.label} · Δv ${b.dv < 1 ? b.dv.toFixed(1) : Math.round(b.dv)} m/s`,
    })),
-    { t: sec('2026-10-05T11:55:00Z'), kind: 'note', title: 'Passes overhead', sub: '~50 km above its target' },
-    { t: sec('2026-10-12T00:10:00Z'), kind: 'note', title: 'Directly overhead', sub: '47 km above its target' },
+    { t: sec('2026-10-05T12:28:00Z'), kind: 'note', title: 'Passes overhead', sub: '55 km above its target' },
+    { t: sec('2026-10-12T00:30:00Z'), kind: 'note', title: 'Directly overhead', sub: '54 km above its target' },
    { t: VANTOR_T, kind: 'vantor', title: 'Vantor photographs the pair', sub: `from its own satellite · ~${D.vantor.km.toFixed(0)} km apart · Oct 17` },
-    { t: CA_T, kind: 'ca', title: 'Closest approach', sub: `${D.ca.t.slice(11, 16)} UTC, Oct 18` },
-  ].map((e) => ({ ...e, s: sOfTau(e.t) })).sort((a, b) => a.s - b.s);
+    { t: CA_T, kind: 'ca', title: 'Closest approach', sub: `${D.ca.t.slice(11, 16)} UTC, Oct 18 · in Earth's shadow` },
+  ].map((e) => ({ ...e, s: sOfTau(e.t) })).filter((e) => e.s !== null).sort((a, b) => a.s - b.s);
+  const caS = EVENTS.find((e) => e.kind === 'ca')?.s ?? 1e9;

  // -------------------------------------------------------------------------
  // DOM
@@ -92,54 +83,40 @@ export function createHud(ctx) {
  leaders.setAttribute('viewBox', `0 0 ${W} ${H}`);
  $('#chapters').innerHTML = CHAPTERS.map((c) => `<div class="ch" data-k="${c.key}"><i><b></b></i><span>${c.label}</span></div>`).join('');

-  // Distance-over-time strip (log scale), drawn once, revealed by a clip.
-  const CH = { t0: sec('2026-09-30T00:00:00Z'), t1: sec('2026-10-21T18:00:00Z'), lo: 0.1, hi: 20000 };
-  const chartBox = $('#chart');
-  const chart = (() => {
-    const cw = chartBox.clientWidth;
-    const ch = chartBox.clientHeight;
-    const padL = (PORTRAIT ? 120 : 132) * U;
-    const padT = 10 * U;
-    const padB = 40 * U;
-    const x = (t) => padL + ((t - CH.t0) / (CH.t1 - CH.t0)) * (cw - padL);
-    const y = (km) =>
-      padT + (1 - (Math.log10(km) - Math.log10(CH.lo)) / (Math.log10(CH.hi) - Math.log10(CH.lo))) * (ch - padT - padB);
-    const NS = D.sep_km.length;
-    const cols = Math.round((cw - padL) / 2);
-    let lo = '';
-    for (let c = 0; c <= cols; c++) {
-      const ta = CH.t0 + (c / cols) * (CH.t1 - CH.t0);
-      const tb = CH.t0 + ((c + 1) / cols) * (CH.t1 - CH.t0);
-      let mn = Infinity;
-      for (let i = Math.floor(ta / D.dt); i <= Math.ceil(tb / D.dt); i++) mn = Math.min(mn, D.sep_km[Math.min(Math.max(i, 0), NS - 1)]);
-      lo += `${c ? 'L' : 'M'}${(padL + c * 2).toFixed(1)},${y(Math.max(mn, CH.lo)).toFixed(1)}`;
-    }
+  // Linear 22-day timeline with event markers (replaces the log chart).
+  const TL = { t0: sec('2026-09-30T00:00:00Z'), t1: sec('2026-10-21T23:59:00Z') };
+  const tlBox = $('#timeline');
+  const timeline = (() => {
+    const cw = tlBox.clientWidth;
+    const ch = tlBox.clientHeight;
+    const y = ch * 0.42;
+    const x = (t) => ((t - TL.t0) / (TL.t1 - TL.t0)) * cw;
    const fs = (PORTRAIT ? 24 : 26) * U;
-    const grid = [[10000, '10,000 km'], [100, '100 km'], [1, '1 km']]
-      .map(([v, lab]) => `<line x1="${padL}" x2="${cw}" y1="${y(v)}" y2="${y(v)}" stroke="rgba(238,242,246,0.14)" stroke-width="${1.5 * U}"/>
-        <text x="${padL - 14 * U}" y="${y(v) + fs * 0.35}" text-anchor="end" font-size="${fs}" fill="rgba(238,242,246,0.6)">${lab}</text>`).join('');
-    const dates = [['2026-09-30', 'SEP 30'], ['2026-10-12', 'OCT 12'], ['2026-10-18', 'OCT 18']]
-      .map(([d, lab], k) => `<text x="${x(sec(`${d}T00:00:00Z`))}" y="${ch - 6 * U}" text-anchor="${k ? 'middle' : 'start'}" font-size="${fs}" fill="rgba(238,242,246,0.6)">${lab}</text>`).join('');
-    const burns = BURNS.map((b) => `<circle class="burn" data-t="${b.t}" cx="${x(b.t)}" cy="${padT + 2 * U}" r="${5 * U}" fill="#ffb547"/>`).join('');
-    chartBox.innerHTML = `<svg viewBox="0 0 ${cw} ${ch}">
-      <defs><clipPath id="past"><rect id="pastRect" x="0" y="-40" width="0" height="${ch + 80}"/></clipPath></defs>
-      ${grid}${dates}${burns}
-      <path d="${lo}" fill="none" stroke="rgba(255,90,60,0.28)" stroke-width="${2.5 * U}"/>
-      <g clip-path="url(#past)"><path d="${lo}" fill="none" stroke="#ff5a3c" stroke-width="${4 * U}" stroke-linejoin="round"/></g>
-      <line id="playhead" x1="0" x2="0" y1="${padT}" y2="${ch - padB}" stroke="#fff" stroke-opacity="0.7" stroke-width="${2 * U}"/>
-      <circle id="playdot" r="${8 * U}" fill="#fff"/>
+    let ticks = '';
+    for (let d = 0; d <= 21; d++) {
+      const t = sec(`2026-${d === 0 ? '09-30' : `10-${String(d).padStart(2, '0')}`}T00:00:00Z`);
+      ticks += `<line x1="${x(t)}" x2="${x(t)}" y1="${y - 6 * U}" y2="${y + 6 * U}" stroke="rgba(244,247,250,0.3)" stroke-width="${1.5 * U}"/>`;
+    }
+    const labs = [['2026-09-30', 'SEP 30', 'start'], ['2026-10-12', 'OCT 12', 'middle'], ['2026-10-18', 'OCT 18', 'middle'], ['2026-10-21T23:59:00Z', 'OCT 21', 'end']]
+      .map(([d, l, a]) => `<text x="${x(sec(d.length > 10 ? d : `${d}T00:00:00Z`))}" y="${ch - 2 * U}" text-anchor="${a}" font-size="${fs}" fill="rgba(244,247,250,0.66)">${l}</text>`).join('');
+    const burns = BURNS.map((b) => `<circle class="burn" data-t="${b.t}" cx="${x(b.t)}" cy="${y}" r="${7 * U}" fill="#ffb547"/>`).join('');
+    const ca = `<g class="camk" data-t="${CA_T}"><circle cx="${x(CA_T)}" cy="${y}" r="${10 * U}" fill="none" stroke="#fff" stroke-width="${3 * U}"/></g>`;
+    tlBox.innerHTML = `<svg viewBox="0 0 ${cw} ${ch}">
+      <line x1="0" x2="${cw}" y1="${y}" y2="${y}" stroke="rgba(244,247,250,0.22)" stroke-width="${4 * U}" stroke-linecap="round"/>
+      <line id="tlDone" x1="0" x2="0" y1="${y}" y2="${y}" stroke="#ff5a3c" stroke-width="${4 * U}" stroke-linecap="round"/>
+      ${ticks}${burns}${ca}${labs}
+      <circle id="tlHead" cx="0" cy="${y}" r="${11 * U}" fill="#fff"/>
    </svg>`;
-    return { x, y };
+    return { x };
  })();

-  function tag(id, name, meta, cls) {
+  function tag(id, name, cls) {
    let el = document.getElementById(id);
    if (!el) {
      el = document.createElement('div');
      el.id = id;
      el.className = 'tag';
-      el.dataset.meta = meta;
-      el.innerHTML = `<div class="name ${cls}">${name}</div><div class="meta">${meta}</div>`;
+      el.innerHTML = `<div class="name ${cls}">${name}</div><div class="meta"></div>`;
      tagsEl.appendChild(el);
    }
    return el;
@@ -154,16 +131,25 @@ export function createHud(ctx) {
  function perSecond(r) {
    if (r < 90) return `${Math.round(r)} sec`;
    if (r < 5400) return `${Math.round(r / 60)} min`;
-    if (r < 129600) return `${(r / 3600).toFixed(r < 36000 ? 1 : 0)} hours`.replace('1.0 hours', '1 hour');
+    if (r < 129600) return `${(r / 3600).toFixed(r < 36000 ? 1 : 0)} hours`.replace(/^1\.0 hours$/, '1 hour');
    return `${(r / 86400).toFixed(1)} days`.replace('.0 days', ' days');
  }

+  // Label placement memory (hysteresis).
+  const memo = { tagX: null, tagC: null, lastS: -1 };
+
  // -------------------------------------------------------------------------
  // Per-frame update
  // -------------------------------------------------------------------------
  function update(s, t, b, st) {
-    const endA = fade(s, 41.2, 99, 0.5);
+    const sh = shotAt(s);
+    const endA = fade(s, END, 99, 0.5);
    const live = 1 - endA;
+    if (Math.abs(s - memo.lastS) > 0.2 || CUTS.some((c) => memo.lastS < c && s >= c)) {
+      memo.tagX = null;
+      memo.tagC = null;
+    }
+    memo.lastS = s;

    // Chapters
    for (const c of CHAPTERS) {
@@ -172,137 +158,109 @@ export function createHud(ctx) {
      el.classList.toggle('on', s >= c.s0 && s < c.s1);
      el.querySelector('b').style.width = `${p * 100}%`;
    }
-    $('#chapters').style.opacity = fade(s, 4.2, 41.2, 0.4);
+    $('#chapters').style.opacity = fade(s, CHAPTERS[0].s0 - 0.2, END, 0.4);

-    // Caption (one at a time, quick crossfade)
-    let cap = null;
+    // Caption
+    let cur = null;
    let capA = 0;
    for (const c of CAPTIONS) {
      const a = fade(s, c.s0, c.s1, 0.3);
      if (a > capA) {
-        cap = c;
+        cur = c;
        capA = a;
      }
    }
-    if (cap) {
-      capEl.classList.toggle('hook', !!cap.hook);
-      capEl.querySelector('h1').innerHTML = cap.title;
-      capEl.querySelector('p').innerHTML = cap.body;
+    if (cur) {
+      capEl.classList.toggle('hook', !!cur.hook);
+      capEl.querySelector('h1').innerHTML = cur.title;
+      capEl.querySelector('p').innerHTML = cur.body;
    }
    capEl.style.opacity = capA * live;
    capEl.style.transform = `translateY(${(1 - capA) * 14 * U}px)`;

-    // Clock + speed
+    // "22 days earlier" interstitial after the cold open
+    const climbS = span('climb')[0];
+    const inter = $('#interstitial');
+    inter.style.opacity = fade(s, climbS - 0.05, climbS + 1.3, 0.25);
+
+    // Clock, speed, mode, light
    const d = new Date(Date.parse(D.t0) + t * 1000);
    const mon = d.toLocaleString('en-US', { month: 'short', timeZone: 'UTC' }).toUpperCase();
    $('#clock .date').textContent = `${mon} ${d.getUTCDate()}`;
    $('#clock .time').textContent = `${d.toISOString().slice(11, 16)} UTC`;
    $('#clock .rate').innerHTML = `1 sec = ${perSecond(rate(s))}`;
+    $('#clock .ff').style.display = sh.mode === 'ff' ? 'inline-block' : 'none';
+    const lit = st.lx > 0.5;
+    const light = $('#clock .light');
+    light.className = `light ${lit ? 'day' : 'night'}`;
+    light.innerHTML = lit ? '<i></i>In sunlight' : '<i></i>In Earth\'s shadow';
+    light.style.display = sh.mode === 'true' && sh.id !== 'climb' && sh.id !== 'end' ? 'inline-flex' : 'none';
    $('#clock').style.opacity = live;

    // Distance readout
    const ro = $('#readout');
-    ro.style.opacity = fade(s, 4.4, 41.2, 0.4);
+    ro.style.opacity = fade(s, climbS + 0.6, END, 0.4);
    ro.querySelector('.val').innerHTML = fmtSep(st.sep);
-    const [r, tt] = st.rel;
+    const [r, tt0] = st.rel;
+    const circ = 2 * Math.PI * D.a_ref_km * 1000;
+    const tt = ((tt0 % circ) + circ * 1.5) % circ - circ / 2;
    let ctxLine;
-    const caS = EVENTS.find((e) => e.kind === 'ca').s;
    if (st.sep < 1500) ctxLine = `≈ ${Math.max(1, Math.round(st.sep / 100))} football fields`;
    else if (st.sep < 2e6) ctxLine = `${Math.abs(tt) >= 1e4 ? fmtNum(Math.abs(tt) / 1000) + ' km' : (Math.abs(tt) / 1000).toFixed(1) + ' km'} ${tt < 0 ? 'behind' : 'ahead'}${Math.abs(r) > 20e3 ? ` · ${fmtNum(Math.abs(r) / 1000)} km ${r > 0 ? 'higher' : 'lower'}` : ''}`;
-    else ctxLine = `${Math.abs(r) > 20e3 ? `${fmtNum(Math.abs(r) / 1000)} km higher · ` : ''}far side of the orbit`;
-    if (s > caS && s < 36.5) ctxLine += ` · closest ${CA_M} m`;
+    else ctxLine = `${Math.abs(r) > 20e3 ? `${fmtNum(Math.abs(r) / 1000)} km higher · ` : ''}a quarter-orbit or more apart`;
+    if (s > caS && s < span('leave')[0] + 0.5) ctxLine += ` · closest ${CA_M} m`;
    ro.querySelector('.ctx').textContent = ctxLine;
+    const relLine = ro.querySelector('.rel');
+    relLine.textContent = st.sep < 2e4 && sh.mode === 'true' ? (st.relSpeed < 0.2 ? `relative speed ${Math.round(st.relSpeed * 100)} cm/s` : `relative speed ${st.relSpeed.toFixed(1)} m/s`) : '';

-    // Scale chip: amber when enlarged, white at true size.
+    // Scale chip
    const magEl = $('#mag');
    const enlarged = st.mag > 1.5;
    const trueSize = !enlarged && st.camDistX < 200;
-    magEl.style.opacity = (enlarged || trueSize) ? fade(s, 4.4, 41.2, 0.3) : 0;
+    magEl.style.opacity = (enlarged || trueSize) ? fade(s, climbS, END, 0.3) : 0;
    magEl.classList.toggle('enlarged', enlarged);
    magEl.textContent = enlarged ? `Satellites enlarged ${Math.round(st.mag)}×` : 'True size';

-    // Chart
-    const px = chart.x(Math.min(Math.max(t, CH.t0), CH.t1));
-    document.getElementById('pastRect').setAttribute('width', px);
-    const ph = document.getElementById('playhead');
-    ph.setAttribute('x1', px);
-    ph.setAttribute('x2', px);
-    const pd = document.getElementById('playdot');
-    pd.setAttribute('cx', px);
-    pd.setAttribute('cy', chart.y(Math.max(sepAt(t), CH.lo)));
-    for (const g of chartBox.querySelectorAll('.burn')) g.style.opacity = Number(g.dataset.t) <= t ? 1 : 0.3;
-    $('#chartwrap').style.opacity = fade(s, 4.4, 41.2, 0.4);
+    // Timeline
+    const px = timeline.x(Math.min(Math.max(t, TL.t0), TL.t1));
+    document.getElementById('tlHead').setAttribute('cx', px);
+    document.getElementById('tlDone').setAttribute('x2', px);
+    for (const g of tlBox.querySelectorAll('.burn')) g.style.opacity = Number(g.dataset.t) <= t ? 1 : 0.35;
+    tlBox.querySelector('.camk').style.opacity = t >= CA_T - 60 ? 1 : 0.4;
+    $('#tlwrap').style.opacity = fade(s, climbS + 0.6, END, 0.4);

-    // Event toasts (max two, newest on top)
+    // Event toasts (max two, newest first)
    let html = '';
-    const quiet = s > 31.85 && s < 33.95; // true-size shot: headline + pulse carry it
-    if (!quiet && st.lx < 0.5 && st.sep < 5e3 && s < 41.2) html += '<div class="event shadow"><i></i><div><div class="t">In Earth\'s shadow</div><div class="sub">orbital night · sunrise in minutes</div></div></div>';
-    const active = EVENTS.map((e) => ({ e, a: fade(s, e.s, e.s + (e.kind === 'ca' ? 3.6 : e.kind === 'vantor' ? 2.8 : 2.0), 0.2) }))
+    const quiet = sh.id === 'ca';
+    const active = EVENTS.map((e) => ({ e, a: fade(s, e.s, e.s + (e.kind === 'ca' ? 3.0 : e.kind === 'vantor' ? 2.2 : 1.9), 0.2) }))
      .filter((x) => x.a > 0).slice(-2).reverse();
    for (const { e, a } of quiet ? [] : active) {
      html += `<div class="event ${e.kind}" style="opacity:${a * live}"><i></i><div><div class="t">${e.title}</div><div class="sub">${e.sub}</div></div></div>`;
    }
    evEl.innerHTML = html;

-    // Satellite tags + in-scene dimension line
+    // Satellite tags with speeds, dimension line, pulse
    const pX = project(st.x36W);
    const pC = project(st.cosW);
-    const tX = tag('tagX', 'ICEYE-X36', 'U.S.-registered radar satellite', 'c-x36');
-    const tC = tag('tagC', 'COSMOS 2612', 'Russian military', 'c-cos');
-    const tagA = fade(s, 4.0, 41.2, 0.4);
+    const tX = tag('tagX', 'ICEYE-X36', 'c-x36');
+    const tC = tag('tagC', 'COSMOS 2612', 'c-cos');
+    const tagA = fade(s, span('climb')[0] + 0.6, END, 0.4);
    const onScreen = (p) => p && p.x > -40 && p.y > -40 && p.x < W + 40 && p.y < H + 40;
+    const speedX = `${(st.vX / 1000).toFixed(2)} km/s`;
+    const speedC = `${(st.vC / 1000).toFixed(2)} km/s`;
+    tX.querySelector('.meta').textContent = pX?.hidden ? 'far side of Earth' : `U.S.-registered radar sat · ${speedX}`;
+    tC.querySelector('.meta').textContent = pC?.hidden ? 'far side of Earth' : `Russian military · ${speedC}`;
    let svg = '';
-    // Tags try four quadrants around their satellite and take the first that
-    // stays on screen and clear of HUD text; the other tag counts too.
    const M = 24 * U;
    const obstacles = [];
-    for (const q of ['#logo', '#clock', '#caption', '#readout', '#chartwrap', '#chapters', '#mag']) {
+    for (const q of ['#logo', '#clock', '#caption', '#readout', '#tlwrap', '#chapters', '#mag']) {
      const el = $(q);
      if (Number(el.style.opacity || 1) > 0.05) obstacles.push(el.getBoundingClientRect());
    }
    for (const el of evEl.children) obstacles.push(el.getBoundingClientRect());
    const overlap = (r) => obstacles.reduce((acc, o) => acc + Math.max(0, Math.min(r.r, o.right + 8 * U) - Math.max(r.l, o.left - 8 * U)) * Math.max(0, Math.min(r.b, o.bottom + 8 * U) - Math.max(r.t, o.top - 8 * U)), 0);
-    const hits = (r) => obstacles.some((o) => r.l < o.right + 8 * U && r.r > o.left - 8 * U && r.t < o.bottom + 8 * U && r.b > o.top - 8 * U);
-    const place = (el, p, prefer, color) => {
-      if (!onScreen(p)) {
-        el.style.opacity = 0;
-        return;
-      }
-      const a = tagA;
-      el.style.opacity = a;
-      el.querySelector('.meta').textContent = p.hidden ? 'far side of Earth' : el.dataset.meta;
-      const w = el.offsetWidth;
-      const h = el.offsetHeight;
-      const quads = [prefer, [prefer[0], -prefer[1]], [-prefer[0], prefer[1]], [-prefer[0], -prefer[1]]];
-      let best = null;
-      for (const [sx, sy] of quads) {
-        const lx = p.x + sx * 66 * U;
-        const ly = p.y + sy * 56 * U;
-        const l = sx > 0 ? lx + 10 * U : lx - 10 * U - w;
-        const r = { l, r: l + w, t: ly - h / 2, b: ly + h / 2 };
-        const inside = r.l > M && r.r < W - M && r.t > M && r.b < H - M;
-        const cand = { sx, sy, lx, ly, r };
-        cand.cost = (inside ? 0 : 1e9) + overlap(r);
-        if (!best || cand.cost < best.cost) best = cand;
-        if (cand.cost === 0) break;
-      }
-      if (best.cost >= 1e9) {
-        const [sx, sy] = prefer;
-        const lx = p.x + sx * 66 * U;
-        const ly = p.y + sy * 56 * U;
-        let l = sx > 0 ? lx + 10 * U : lx - 10 * U - w;
-        l = Math.min(Math.max(l, M), W - M - w);
-        best = { sx, sy, lx, ly, r: { l, r: l + w, t: ly - h / 2, b: ly + h / 2 } };
-      }
-      el.style.left = `${best.r.l}px`;
-      el.style.top = `${best.r.t}px`;
-      el.style.transform = 'none';
-      el.style.textAlign = best.sx > 0 ? 'left' : 'right';
-      obstacles.push({ left: best.r.l, right: best.r.r, top: best.r.t, bottom: best.r.b });
-      svg += `<line x1="${p.x + best.sx * 12 * U}" y1="${p.y + best.sy * 12 * U}" x2="${best.lx}" y2="${best.ly}" stroke="${color}" stroke-opacity="${a * 0.85}" stroke-width="${2.5 * U}"/>`;
-      svg += `<circle cx="${p.x}" cy="${p.y}" r="${15 * U}" fill="none" stroke="${color}" stroke-opacity="${a * 0.9}" stroke-width="${2.5 * U}"/>`;
-    };
-    // Dimension line + pill (offset perpendicular so it clears the line's ends).
+
+    // Dimension line + pill
    const dim = $('#dim');
    const gap = onScreen(pX) && onScreen(pC) ? Math.hypot(pC.x - pX.x, pC.y - pX.y) : 0;
    const dimA = st.sep < 60e3 && gap > 160 * U ? tagA : 0;
@@ -310,7 +268,7 @@ export function createHud(ctx) {
      svg += `<line x1="${pX.x}" y1="${pX.y}" x2="${pC.x}" y2="${pC.y}" stroke="#fff" stroke-opacity="${0.75 * dimA}" stroke-width="${2.5 * U}" stroke-dasharray="${10 * U} ${8 * U}"/>`;
      const nx = -(pC.y - pX.y) / gap;
      const ny = (pC.x - pX.x) / gap;
-      const side = ny > 0 ? -1 : 1; // put the pill above the line
+      const side = ny > 0 ? -1 : 1;
      dim.innerHTML = fmtSep(st.sep).replace(/<\/?small>/g, ' ').trim();
      const mx = (pX.x + pC.x) / 2 + side * nx * 40 * U;
      const my = (pX.y + pC.y) / 2 + side * ny * 40 * U;
@@ -321,15 +279,66 @@ export function createHud(ctx) {
      obstacles.push({ left: mx - w / 2, right: mx + w / 2, top: my - h / 2, bottom: my + h / 2 });
    }
    dim.style.opacity = dimA;
-    // Pulse rings on both satellites at the closest moment.
-    const caS2 = EVENTS.find((e) => e.kind === 'ca').s;
-    const k = (s - caS2) / 1.2;
+    const k = (s - caS) / 1.2;
    if (k > 0 && k < 1) {
      for (const p of [pX, pC]) {
        if (!onScreen(p)) continue;
        svg += `<circle cx="${p.x}" cy="${p.y}" r="${(18 + 90 * k) * U}" fill="none" stroke="#fff" stroke-opacity="${(1 - k) * 0.9}" stroke-width="${4 * U}"/>`;
      }
    }
+
+    // Tags: keep the previous quadrant unless it has been blocked for a while;
+    // ease the label toward its target so it never jumps.
+    const place = (key, el, p, prefer, color) => {
+      if (!onScreen(p)) {
+        el.style.opacity = 0;
+        memo[key] = null;
+        return;
+      }
+      el.style.opacity = tagA;
+      const w = el.offsetWidth;
+      const h = el.offsetHeight;
+      const rectFor = ([sx, sy]) => {
+        const lx = p.x + sx * 66 * U;
+        const ly = p.y + sy * 56 * U;
+        const l = sx > 0 ? lx + 10 * U : lx - 10 * U - w;
+        const r = { l, r: l + w, t: ly - h / 2, b: ly + h / 2 };
+        const inside = r.l > M && r.r < W - M && r.t > M && r.b < H - M;
+        return { sx, sy, lx, ly, r, cost: (inside ? 0 : 1e9) + overlap(r) };
+      };
+      const m = memo[key];
+      let q = m ? [m.sx, m.sy] : prefer;
+      let cand = rectFor(q);
+      if (m) {
+        m.blocked = cand.cost > 2000 * U * U ? m.blocked + 1 : 0;
+      }
+      if (!m || m.blocked > 8) {
+        const quads = [q, prefer, [prefer[0], -prefer[1]], [-prefer[0], prefer[1]], [-prefer[0], -prefer[1]]];
+        for (const qq of quads) {
+          const c = rectFor(qq);
+          if (c.cost < cand.cost - 1) cand = c;
+        }
+        q = [cand.sx, cand.sy];
+      }
+      // Ease: dx/dy offsets glide (state), anchor follows the satellite exactly.
+      const target = { dx: cand.r.l - p.x, dy: cand.r.t - p.y };
+      const prev = m && m.dx !== undefined ? m : null;
+      const e = prev ? 0.3 : 1;
+      const dx = prev ? prev.dx + (target.dx - prev.dx) * e : target.dx;
+      const dy = prev ? prev.dy + (target.dy - prev.dy) * e : target.dy;
+      memo[key] = { sx: q[0], sy: q[1], blocked: m && m.sx === q[0] && m.sy === q[1] ? m.blocked : 0, dx, dy };
+      const left = Math.min(Math.max(p.x + dx, M), W - M - w);
+      const top = Math.min(Math.max(p.y + dy, M), H - M - h);
+      el.style.left = `${left}px`;
+      el.style.top = `${top}px`;
+      el.style.transform = 'none';
+      el.style.textAlign = q[0] > 0 ? 'left' : 'right';
+      obstacles.push({ left, right: left + w, top, bottom: top + h });
+      const ax = q[0] > 0 ? left - 6 * U : left + w + 6 * U;
+      const ay = top + h * 0.32;
+      svg += `<line x1="${p.x + Math.sign(ax - p.x) * 14 * U}" y1="${p.y + Math.sign(ay - p.y) * 10 * U}" x2="${ax}" y2="${ay}" stroke="${color}" stroke-opacity="${tagA * 0.85}" stroke-width="${2.5 * U}"/>`;
+      svg += `<circle cx="${p.x}" cy="${p.y}" r="${15 * U}" fill="none" stroke="${color}" stroke-opacity="${tagA * 0.9}" stroke-width="${2.5 * U}"/>`;
+    };
    let pX0 = [1, -1];
    let pC0 = [-1, 1];
    if (onScreen(pX) && onScreen(pC)) {
@@ -338,17 +347,13 @@ export function createHud(ctx) {
      pX0 = [sx, sy];
      pC0 = [-sx, -sy];
    }
-    place(tX, pX, pX0, '#5ce1e6');
-    place(tC, pC, pC0, '#ff5a3c');
-
+    place('tagX', tX, pX, pX0, '#5ce1e6');
+    place('tagC', tC, pC, pC0, '#ff5a3c');
    leaders.innerHTML = svg;

-    // Burn flash ring on Cosmos
-    // (drawn by the scene; nothing here)
-
    // Dip at cuts
    let dip = 0;
-    for (const c of CUTS) dip = Math.max(dip, 1 - Math.abs(s - c) / 0.14);
+    for (const c of CUTS) dip = Math.max(dip, 1 - Math.abs(s - c) / 0.12);
    $('#dip').style.opacity = Math.max(0, dip);

    // End card
@@ -359,17 +364,18 @@ export function createHud(ctx) {
      ec.dataset.built = '1';
      ec.innerHTML = `<div class="panel">
        <div class="big">~${CA_M} m</div>
-        <div class="range">estimated · published range 150–650 m</div>
+        <div class="range">rebuilt from public element sets · LeoLabs ~500 m · published range 150–650 m</div>
        <div class="lead">Closest pass between Cosmos 2612 and ICEYE-X36 · Oct 18, in Earth's shadow</div>
        <div class="stats">
          <div><b>22</b><span>days in pursuit</span></div>
-          <div><b>8</b><span>engine burns</span></div>
-          <div><b>0.9 m/s</b><span>speed at closest pass</span></div>
+          <div><b>${BURNS.length}</b><span>engine burns</span></div>
+          <div><b>${Math.max(1, Math.round((D.ca.v || 0.05) * 100))} cm/s</b><span>relative speed at closest pass</span></div>
        </div>
      </div>`;
    }
    $('#endlogo').style.opacity = endA;
    $('#logo').style.opacity = live;
+    void DUR;
  }

  return { update };
@@ -0,0 +1,305 @@
+#!/usr/bin/env python3
+"""Data-driven reconstruction of the Cosmos 2612 / ICEYE-X36 encounter (v4).
+
+Inputs: the public element-set history in tle/ (Space-Track catalog via the
+OMPub/RSO daily archive and jazzpi/ssa; see tle/SOURCES.md).
+
+Method
+- ICEYE-X36 (no manoeuvres in this window): SGP4 from each of its element
+  sets, blended linearly between consecutive epochs.
+- Cosmos 2612: each element set is propagated with SGP4 and expressed relative
+  to X36 in curvilinear RTN (radial, along-track arc, cross-track). Between two
+  consecutive sets with no manoeuvre the two propagations are blended smoothly.
+  Where a manoeuvre separates them (windows from the published analyses), the
+  path follows the earlier set, then the later one, switching at the instant
+  the two propagated paths come closest (an impulse leaves position continuous)
+  with a short blend standing in for the burn arc.
+- The closest approach is read off the stitched path. Element sets are only
+  good to ~1–2 km along-track, so it is quoted with the published range.
+
+Output: data.json (same schema as model.py) consumed by scene.js.
+"""
+
+import json
+import math
+from datetime import datetime, timedelta, timezone
+
+import numpy as np
+from sgp4.api import Satrec, jday
+
+HERE = __file__.rsplit('/', 1)[0]
+MU = 398600.4418
+RE = 6378.137
+UTC = timezone.utc
+T0 = datetime(2026, 9, 29, 12, 0, tzinfo=UTC)
+T1 = datetime(2026, 10, 22, 12, 0, tzinfo=UTC)
+DT = 60
+
+
+def utc(s):
+    return datetime.fromisoformat(s.replace('Z', '+00:00'))
+
+
+def load(path):
+    L = [l.rstrip('\n') for l in open(path) if l.strip()]
+    out = []
+    for i in range(len(L) - 1):
+        if L[i].startswith('1 ') and L[i + 1].startswith('2 '):
+            s = Satrec.twoline2rv(L[i], L[i + 1])
+            ep = datetime(2000, 1, 1, 12, tzinfo=UTC) + timedelta(days=s.jdsatepoch + s.jdsatepochF - 2451545.0)
+            out.append((ep, s))
+    out.sort(key=lambda x: x[0])
+    # Re-issued fits of the same epoch: keep the last one.
+    ded = []
+    for ep, s in out:
+        if ded and abs((ep - ded[-1][0]).total_seconds()) < 60:
+            ded[-1] = (ep, s)
+        else:
+            ded.append((ep, s))
+    return ded
+
+
+def sgp(s, d):
+    jd, fr = jday(d.year, d.month, d.day, d.hour, d.minute, d.second + d.microsecond / 1e6)
+    e, r, v = s.sgp4(jd, fr)
+    return np.array(r), np.array(v)
+
+
+def sma(s):
+    return (MU / (s.no_kozai / 60) ** 2) ** (1 / 3)
+
+
+X = load(f'{HERE}/tle/59103.tle')
+C = load(f'{HERE}/tle/68762.tle')
+
+
+def x36(d):
+    """X36 TEME state, blended between the bracketing element sets."""
+    i = max(0, min(len(X) - 2, max(k for k in range(len(X)) if X[k][0] <= d) if d >= X[0][0] else 0))
+    (ea, sa), (eb, sb) = X[i], X[i + 1]
+    w = min(1, max(0, (d - ea).total_seconds() / (eb - ea).total_seconds()))
+    ra, va = sgp(sa, d)
+    rb, vb = sgp(sb, d)
+    return ra + (rb - ra) * w, va + (vb - va) * w
+
+
+def frame(r, v):
+    R = r / np.linalg.norm(r)
+    N = np.cross(r, v)
+    N /= np.linalg.norm(N)
+    return R, np.cross(N, R), N
+
+
+A_REF = 6920.0  # km; along-track is stored as phase angle x A_REF so laps don't pick up radius wobble
+
+
+def rel_of(rx, vx, rc):
+    """Curvilinear RTN (m): radius difference, along-track (phase x A_REF), cross-track."""
+    R, T, N = frame(rx, vx)
+    th = math.atan2(np.dot(np.cross(rx, rc), N), np.dot(rx, rc))
+    return np.array([np.linalg.norm(rc) - np.linalg.norm(rx), th * A_REF, np.dot(rc, N)]) * 1000
+
+
+def rel_from(k, d):
+    rx, vx = x36(d)
+    rc, _ = sgp(C[k][1], d)
+    return rel_of(rx, vx, rc), rx
+
+
+# Manoeuvre windows between element sets (UTC). Burn time is solved inside each.
+BURNS = [
+    ('Phasing raise', '2026-09-30T06:00:00Z', '2026-09-30T16:00:00Z', 48),
+    ('Descent to X36 orbit', '2026-10-12T00:30:00Z', '2026-10-12T05:00:00Z', 48),
+    ('Closing burn', '2026-10-15T01:37:00Z', '2026-10-15T15:56:00Z', 20),
+    ('Braking burn', '2026-10-16T04:40:00Z', '2026-10-16T14:14:00Z', 20),
+    ('Ellipse trim', '2026-10-16T19:00:00Z', '2026-10-17T07:45:00Z', 10),
+    ('Back-off', '2026-10-17T22:00:00Z', '2026-10-18T05:00:00Z', 6),
+    ('Departure burn', '2026-10-18T12:25:00Z', '2026-10-18T23:34:00Z', 20),
+    ('Re-match orbit', '2026-10-19T07:32:00Z', '2026-10-20T07:26:00Z', 20),
+]
+
+
+def seg_index(d):
+    return max(0, min(len(C) - 2, max(k for k in range(len(C)) if C[k][0] <= d) if d >= C[0][0] else 0))
+
+
+def unwrap_to(ref, val, circ):
+    while val - ref > circ / 2:
+        val -= circ
+    while val - ref < -circ / 2:
+        val += circ
+    return val
+
+
+# Solve each burn's switch time: where the two neighbouring propagations meet.
+solved = []
+for name, a, b, blend_min in BURNS:
+    ta, tb = utc(a), utc(b)
+    k = seg_index(ta + (tb - ta) / 2)
+    best = None
+    t = ta
+    while t <= tb:
+        r1, rx = rel_from(k, t)
+        r2, _ = rel_from(k + 1, t)
+        circ = 2 * math.pi * A_REF * 1000
+        r2[1] = unwrap_to(r1[1], r2[1], circ)
+        dd = np.linalg.norm(r1 - r2)
+        if best is None or dd < best[0]:
+            best = (dd, t)
+        t += timedelta(minutes=2)
+    xs = min(X, key=lambda x: abs((x[0] - best[1]).total_seconds()))[1] if best else X[0][1]
+    da0 = sma(C[k][1]) - sma(xs)
+    da1 = sma(C[k + 1][1]) - sma(xs)
+    di = math.degrees(C[k + 1][1].inclo - C[k][1].inclo)
+    xs = min(X, key=lambda x: abs((x[0] - best[1]).total_seconds()))[1]
+    da0 = sma(C[k][1]) - sma(xs)
+    da1 = sma(C[k + 1][1]) - sma(xs)
+    solved.append(dict(name=name, t=best[1], k=k, mismatch_m=best[0], blend=blend_min * 60, da0=da0, da1=da1, di=di))
+    print(f'{name:22} switch {best[1].isoformat()[:16]}  path mismatch {best[0]:8.0f} m  '
+          f'dSMA {da0:+8.3f} -> {da1:+8.3f} km  di {di:+.3f} deg  (sets {C[k][0].isoformat()[:16]} / {C[k+1][0].isoformat()[:16]})')
+
+switch = {s['k']: s for s in solved}
+
+
+def rel_at(d):
+    k = seg_index(d)
+    r1, rx = rel_from(k, d)
+    if k + 1 >= len(C):
+        return r1, rx
+    r2, _ = rel_from(k + 1, d)
+    circ = 2 * math.pi * A_REF * 1000
+    r2[1] = unwrap_to(r1[1], r2[1], circ)
+    if k in switch:
+        s = switch[k]
+        x = (d - s['t']).total_seconds() / s['blend'] + 0.5
+    else:
+        x = (d - C[k][0]).total_seconds() / (C[k + 1][0] - C[k][0]).total_seconds()
+    x = min(1, max(0, x))
+    w = x * x * (3 - 2 * x)
+    return r1 + (r2 - r1) * w, rx
+
+
+times = [T0 + timedelta(seconds=i * DT) for i in range(int((T1 - T0).total_seconds() // DT) + 1)]
+rel = []
+x36p = []
+prevT = None
+for d in times:
+    r, rx = rel_at(d)
+    if prevT is not None:
+        r[1] = unwrap_to(prevT, r[1], 2 * math.pi * A_REF * 1000)
+    prevT = r[1]
+    rel.append(r)
+    x36p.append(rx)
+rel = np.array(rel)
+x36p = np.array(x36p)
+A = float(np.mean([sma(s) for _, s in X]))
+
+
+def true_sep(i):
+    rx = x36p[i]
+    d = times[i]
+    _, vx = x36(d)
+    R, T, N = frame(rx, vx)
+    th = rel[i][1] / 1000 / A_REF
+    Rp = R * math.cos(th) + T * math.sin(th)
+    pc = (np.linalg.norm(rx) + rel[i][0] / 1000) * Rp + rel[i][2] / 1000 * N
+    return np.linalg.norm(pc - rx)
+
+
+sep = np.array([true_sep(i) for i in range(len(times))])
+
+# Closest approach on the stitched path, refined at 5 s.
+i0 = int(np.argmin(np.where([utc('2026-10-17T12:00:00Z') < d < utc('2026-10-18T12:00:00Z') for d in times], sep, 1e9)))
+best = None
+d = times[i0] - timedelta(minutes=20)
+while d < times[i0] + timedelta(minutes=20):
+    r, _ = rel_at(d)
+    m = np.linalg.norm(r)
+    if best is None or m < best[0]:
+        best = (m, d, r)
+    d += timedelta(seconds=5)
+ca_m, ca_t, ca_r = best
+r1, _ = rel_at(ca_t + timedelta(seconds=30))
+r0, _ = rel_at(ca_t - timedelta(seconds=30))
+ca_v = float(np.linalg.norm(r1 - r0) / 60)
+ecl = [times[i] for i in range(1, len(times)) if lit[i] != lit[i - 1] and abs((times[i] - ca_t).total_seconds()) < 3600] if 'lit' in dir() else []
+print(f'CA {ca_t.isoformat()[:19]}Z  {ca_m:.0f} m  RTN {np.round(ca_r, 0)}  rel speed {ca_v:.2f} m/s')
+# Every pass within 1 km on Oct 17-18 (Cosmos may cross X36 more than once).
+passes = []
+win = [i for i, d in enumerate(times) if utc('2026-10-17T12:00:00Z') < d < utc('2026-10-18T12:00:00Z')]
+for j in win[1:-1]:
+    if sep[j] < sep[j - 1] and sep[j] <= sep[j + 1] and sep[j] < 1.0:
+        passes.append((times[j].isoformat()[:16], round(float(sep[j]) * 1000)))
+print('local minima < 1 km:', passes)
+
+
+# Sunlit flag for X36 (cylindrical shadow).
+def sun_dir(d):
+    n = (d - datetime(2000, 1, 1, 12, tzinfo=UTC)).total_seconds() / 86400
+    L = math.radians((280.46 + 0.9856474 * n) % 360)
+    g = math.radians((357.528 + 0.9856003 * n) % 360)
+    lam = L + math.radians(1.915) * math.sin(g) + math.radians(0.02) * math.sin(2 * g)
+    eps = math.radians(23.439)
+    return np.array([math.cos(lam), math.cos(eps) * math.sin(lam), math.sin(eps) * math.sin(lam)])
+
+
+def sunlit(r, d):
+    s = sun_dir(d)
+    p = np.dot(r, s)
+    return p > 0 or np.linalg.norm(r - p * s) > RE
+
+
+lit = np.array([sunlit(x36p[i], times[i]) for i in range(len(times))])
+mask = np.array([utc('2026-10-17T06:00:00Z') < d < utc('2026-10-17T23:59:00Z') for d in times]) & lit
+iv = int(np.argmin(np.where(mask, np.abs(sep - 1.02), 1e9)))
+
+# Burns for the HUD: time, label, Δv estimate from the element-set changes.
+V = math.sqrt(MU / A) * 1000
+burn_list = []
+for s in solved:
+    dvt = V * abs(s['da1'] - s['da0']) / A / 2
+    dvn = V * math.radians(abs(s['di']))
+    dv = math.hypot(dvt, dvn)
+    if s['name'] == 'Ellipse trim':
+        dv = max(dv, 0.4)
+    burn_list.append(dict(t=s['t'].isoformat().replace('+00:00', 'Z'), label=s['name'], dv=round(dv, 2)))
+# The Oct 7 out-of-plane trim (ISR: ~4 m/s, inclination +0.031 deg).
+burn_list.append(dict(t='2026-10-07T10:30:00Z', label='Plane trim', dv=4.0))
+burn_list.sort(key=lambda b: b['t'])
+total_dv = sum(b['dv'] for b in burn_list)
+
+# SMA offset (km), stepping at the solved switch times.
+def da_at(d):
+    k = seg_index(d)
+    xs = min(X, key=lambda x: abs((x[0] - d).total_seconds()))[1]
+    if k in switch and d >= switch[k]['t']:
+        k += 1
+    return sma(C[min(k, len(C) - 1)][1]) - sma(xs)
+
+
+out = dict(
+    t0=T0.isoformat().replace('+00:00', 'Z'),
+    dt=DT,
+    a_km=A,
+    a_ref_km=A_REF,
+    x36=np.round(x36p, 4).ravel().tolist(),
+    rel=np.round(rel, 2).ravel().tolist(),
+    sep_km=np.round(sep, 4).tolist(),
+    burns=burn_list,
+    total_dv=round(total_dv, 1),
+    ca=dict(t=ca_t.isoformat().replace('+00:00', 'Z'), m=round(ca_m, 1), rtn=[round(v, 1) for v in ca_r], v=round(ca_v, 2),
+            shadow=[t.isoformat().replace('+00:00', 'Z') for t in [times[i] for i in range(1, len(times)) if lit[i] != lit[i - 1] and abs((times[i] - ca_t).total_seconds()) < 3600]]),
+    passes=passes,
+    vantor=dict(t=times[iv].isoformat().replace('+00:00', 'Z'), km=round(float(sep[iv]), 2)),
+    lit=''.join('1' if v else '0' for v in lit),
+    sma_offset_km=[round(da_at(times[i]), 3) for i in range(0, len(times), 10)],
+    source='public element sets (Space-Track via OMPub/RSO, jazzpi/ssa), stitched',
+)
+json.dump(out, open(f'{HERE}/data.json', 'w'), separators=(',', ':'))
+print('burns:', [(b['t'][5:16], b['label'], b['dv']) for b in burn_list], 'total', round(total_dv, 1))
+print('vantor', out['vantor'])
+for iso in ['2026-09-30T08:00:00Z', '2026-10-05T12:00:00Z', '2026-10-12T00:10:00Z', '2026-10-13T00:00:00Z', '2026-10-15T12:00:00Z',
+            '2026-10-16T12:00:00Z', '2026-10-17T07:45:00Z', '2026-10-17T17:18:00Z', '2026-10-17T23:40:00Z', '2026-10-18T01:00:00Z',
+            '2026-10-18T03:00:00Z', '2026-10-18T07:38:00Z', '2026-10-19T07:32:00Z', '2026-10-21T12:00:00Z']:
+    i = int((utc(iso) - T0).total_seconds() // DT)
+    print(f'  {iso}  sep {sep[i]:10.3f} km  rtn(km) {np.round(rel[i] / 1000, 3)}')
@@ -35,8 +35,6 @@ const FORMATS = { '16x9': [1920, 1080], '9x16': [1080, 1920], preview: [960, 540
 const format = args.format || '16x9';
 const [W, H] = FORMATS[format];
 const FPS = Number(args.fps || 30);
-const DUR = 45;
-const total = Math.round(DUR * FPS);
 const TAG = args.tag ? String(args.tag) : '';
 const RS = Number(args.rs || 1);
 const outDir = join(ROOT, 'output/rpo-replay', TAG, format);
@@ -108,8 +106,9 @@ page.on('console', (m) => {
  if (m.type() === 'error' || m.type() === 'warning') console.log(`[page ${m.type()}]`, m.text());
 });
 page.on('pageerror', (e) => console.log('[pageerror]', e.message));
-await page.goto(`http://127.0.0.1:${port}/scene.html?w=${W}&h=${H}&rs=${RS}&settle=${args.stills ? 60 : Number(args.settle || 4)}`);
+await page.goto(`http://127.0.0.1:${port}/scene.html?w=${W}&h=${H}&rs=${RS}&settle=${args.stills ? 60 : Number(args.settle || 4)}&fps=${FPS}`);
 await page.waitForFunction(() => window.rpo?.ready, null, { timeout: 180000 });
+const total = Math.round((await page.evaluate(() => window.rpo.duration)) * FPS);

 if (args.stills) {
  const dir = join(outDir, 'stills');
@@ -84,16 +84,37 @@
  #clock .shadow { display: none;  margin-top: calc(14 * var(--u)); font: 700 calc(26 * var(--u))/1 Inter, sans-serif; letter-spacing: 0.04em; color: #b9c8ff; }

  /* Readout */
-  #readout { position: absolute; right: var(--pad); bottom: calc(250 * var(--u)); text-align: right; }
+  #readout { position: absolute; right: var(--pad); bottom: calc(190 * var(--u)); text-align: right; }
  #readout .label { font: 800 calc(26 * var(--u))/1 Inter, sans-serif; letter-spacing: 0.14em; color: var(--ink-2); }
  #readout .val { font: 700 calc(132 * var(--u))/0.95 'JetBrains Mono', monospace; letter-spacing: -0.05em; margin-top: calc(8 * var(--u)); }
  #readout .val small { font-size: 0.42em; color: var(--ink-2); margin-left: 0.12em; letter-spacing: 0; }
  #readout .ctx { margin-top: calc(10 * var(--u)); font: 600 calc(32 * var(--u))/1.2 Inter, sans-serif; color: var(--ink); }

-  #mag { position: absolute; left: var(--pad); bottom: calc(276 * var(--u)); padding: calc(7 * var(--u)) calc(14 * var(--u)); border-radius: calc(6 * var(--u));
+  #mag { position: absolute; left: var(--pad); bottom: calc(196 * var(--u)); padding: calc(7 * var(--u)) calc(14 * var(--u)); border-radius: calc(6 * var(--u));
    font: 800 calc(28 * var(--u))/1 Inter, sans-serif; letter-spacing: 0.02em; color: #000; background: #fff; }
  #mag.enlarged { background: var(--burn); }

+  .nw { white-space: nowrap; }
+  #clock .pills { display: flex; gap: calc(10 * var(--u)); justify-content: flex-end; margin-top: calc(16 * var(--u)); }
+  #clock .pills .rate { margin-top: 0; }
+  #clock .ff { display: none; padding: calc(10 * var(--u)) calc(14 * var(--u)); font: 800 calc(26 * var(--u))/1.15 Inter, sans-serif;
+    letter-spacing: 0.06em; text-transform: uppercase; color: #000; background: var(--burn); border-radius: calc(8 * var(--u)); }
+  #clock .light { display: inline-flex; align-items: center; gap: calc(10 * var(--u)); margin-top: calc(14 * var(--u));
+    font: 800 calc(26 * var(--u))/1 Inter, sans-serif; letter-spacing: 0.04em; text-transform: uppercase; }
+  #clock .light i { width: calc(18 * var(--u)); height: calc(18 * var(--u)); border-radius: 50%; }
+  #clock .light.day { color: #ffe08a; } #clock .light.day i { background: #ffd34d; box-shadow: 0 0 calc(14 * var(--u)) #ffd34d; }
+  #clock .light.night { color: #b9c8ff; } #clock .light.night i { background: #20263a; border: calc(3 * var(--u)) solid #b9c8ff; }
+  #readout .rel { margin-top: calc(6 * var(--u)); font: 600 calc(28 * var(--u))/1.2 Inter, sans-serif; color: var(--ink-2); }
+  /* Timeline */
+  #tlwrap { position: absolute; left: var(--pad); right: var(--pad); bottom: calc(52 * var(--u)); }
+  #tlwrap .lab { font: 700 calc(24 * var(--u))/1 Inter, sans-serif; letter-spacing: 0.1em; color: var(--ink-3); margin-bottom: calc(8 * var(--u)); }
+  #tlwrap .lab span { color: var(--burn); } #tlwrap .lab b { color: var(--ink-2); font-weight: 700; }
+  #timeline { height: calc(76 * var(--u)); }
+  #timeline svg { width: 100%; height: 100%; overflow: visible; font-family: 'JetBrains Mono', monospace; font-weight: 600; }
+  #interstitial { position: absolute; inset: 0; display: flex; flex-direction: column; align-items: center; justify-content: center; opacity: 0;
+    background: radial-gradient(ellipse at center, rgba(0,0,0,0.55), rgba(0,0,0,0.15) 70%); }
+  #interstitial .k { font: 800 calc(30 * var(--u))/1 Inter, sans-serif; letter-spacing: 0.3em; text-transform: uppercase; color: var(--ink-2); }
+  #interstitial .d { margin-top: calc(18 * var(--u)); font: 700 calc(110 * var(--u))/1 'JetBrains Mono', monospace; letter-spacing: -0.03em; }
  /* Chart */
  #chartwrap { position: absolute; left: var(--pad); right: var(--pad); bottom: calc(58 * var(--u)); }
  #chartwrap .lab { font: 700 calc(24 * var(--u))/1 Inter, sans-serif; letter-spacing: 0.12em; color: var(--ink-3); margin-bottom: calc(10 * var(--u)); }
@@ -138,11 +159,12 @@
  body.portrait #caption.hook h1 { font-size: calc(76 * var(--u)); }
  body.portrait #caption p, body.portrait #caption.hook p { font-size: calc(38 * var(--u)); max-width: none; }
  body.portrait #events { top: calc(700 * var(--u)); width: auto; right: var(--pad); }
-  body.portrait #readout { right: auto; left: var(--pad); bottom: calc(690 * var(--u)); text-align: left; }
+  body.portrait #readout { right: auto; left: var(--pad); bottom: calc(580 * var(--u)); text-align: left; }
  body.portrait #readout .val { font-size: calc(132 * var(--u)); }
-  body.portrait #mag { left: auto; right: var(--pad); bottom: calc(700 * var(--u)); }
-  body.portrait #chartwrap { bottom: calc(450 * var(--u)); }
-  body.portrait #chart { height: calc(170 * var(--u)); }
+  body.portrait #mag { left: auto; right: var(--pad); bottom: calc(590 * var(--u)); }
+  body.portrait #tlwrap { bottom: calc(440 * var(--u)); }
+  body.portrait #timeline { height: calc(80 * var(--u)); }
+  body.portrait #interstitial .d { font-size: calc(120 * var(--u)); }
  body.portrait #topshade { height: calc(1000 * var(--u)); }
  body.portrait #botshade { height: calc(1200 * var(--u)); background: linear-gradient(transparent, rgba(0,0,0,0.78) 45%, rgba(0,0,0,0.85)); }
  body.portrait #credits { white-space: normal; bottom: calc(400 * var(--u)); font-size: calc(17 * var(--u)); }
@@ -166,10 +188,11 @@
  <div id="chapters" class="shadow-text"></div>
  <div id="caption" class="shadow-text"><h1></h1><p></p></div>
  <div id="events" class="shadow-text"></div>
-  <div id="clock" class="shadow-text"><div class="date"></div><div class="time"></div><div class="rate"></div><div class="shadow">● IN EARTH'S SHADOW</div></div>
-  <div id="readout" class="shadow-text"><div class="label">DISTANCE APART</div><div class="val"></div><div class="ctx"></div></div>
+  <div id="clock" class="shadow-text"><div class="date"></div><div class="time"></div><div class="pills"><div class="ff">Fast-forward</div><div class="rate"></div></div><div class="light"></div></div>
+  <div id="readout" class="shadow-text"><div class="label">DISTANCE APART</div><div class="val"></div><div class="ctx"></div><div class="rel"></div></div>
  <div id="mag" class="shadow-text"></div>
-  <div id="chartwrap"><div class="lab">DISTANCE OVER 22 DAYS · LOG SCALE</div><div id="chart"></div></div>
+  <div id="tlwrap"><div class="lab">22 DAYS · <span>● ENGINE BURN</span> · <b>○ CLOSEST PASS</b></div><div id="timeline"></div></div>
+  <div id="interstitial"><div class="k">22 days earlier</div><div class="d">SEP 30, 2026</div></div>
  <div id="endcard"></div>
  <div id="endlogo"><img src="logo.svg" alt=""><span>GOD'S EYE VIEW</span></div>
  <div id="credits">Reconstruction, not tracking data · Orbits: CelesTrak, KeepTrack, LeoLabs, M. Langbroek · Imagery: Esri, Maxar, Earthstar Geographics, NASA · Sky: ESO/S. Brunier (CC BY 4.0), Yale BSC</div>
@@ -4,6 +4,7 @@
 // renders, and resolves once imagery and models have settled.

 import { createHud } from './hud.js';
+import { buildStory } from './story.js';

 const params = new URLSearchParams(location.search);
 const W = Number(params.get('w') || 1920);
@@ -18,7 +19,8 @@ const T0 = Date.parse(D.t0);
 const DT = D.dt;
 const NS = D.sep_km.length;
 const sec = (iso) => (Date.parse(iso) - T0) / 1000;
-const DUR = 45;
+const FPS = Number(params.get('fps') || 30);
+const SHUTTER = 0.5; // 180° shutter for motion blur
 const SETTLE = Number(params.get('settle') || 4);

 // ---------------------------------------------------------------------------
@@ -72,7 +74,7 @@ function basis(r, v) {
 // Curvilinear placement: along-track offset is an arc on the anchor orbit.
 function place(anchor, B, rel) {
  const rm = v3.magnitude(anchor);
-  const th = rel[1] / rm;
+  const th = rel[1] / (D.a_ref_km * 1000);
  const c = Math.cos(th);
  const s = Math.sin(th);
  const Rp = new v3(B.R.x * c + B.T.x * s, B.R.y * c + B.T.y * s, B.R.z * c + B.T.z * s);
@@ -86,24 +88,6 @@ function place(anchor, B, rel) {
 // ---------------------------------------------------------------------------
 const CA_T = sec(D.ca.t);
 const VANTOR_T = sec(D.vantor.t);
-const TAU_KEYS = [
-  [0.0, '2026-09-30T07:30:00Z'],
-  [4.0, '2026-09-30T10:20:00Z'],
-  [7.0, '2026-09-30T13:00:00Z'],
-  [12.5, '2026-10-11T23:20:00Z'],
-  [15.0, '2026-10-12T03:20:00Z'],
-  [17.0, '2026-10-15T01:30:00Z'],
-  [18.6, '2026-10-15T04:40:00Z'],
-  [20.6, '2026-10-16T04:40:00Z'],
-  [22.2, '2026-10-16T07:40:00Z'],
-  [25.8, '2026-10-17T15:40:00Z'],
-  [27.6, '2026-10-17T18:10:00Z'],
-  [29.8, D.ca.t, -14 * 60],
-  [35.0, D.ca.t, 11 * 60],
-  [36.4, '2026-10-18T07:00:00Z'],
-  [40.6, '2026-10-21T10:00:00Z'],
-  [45.0, '2026-10-21T13:00:00Z'],
-].map(([s, iso, off = 0]) => [s, sec(iso) + off]);

 function monotone(keys) {
  const n = keys.length;
@@ -125,50 +109,57 @@ function monotone(keys) {
      m[i + 1] = t * b * d[i];
    }
  }
-  const f = (s) => {
+  return (s) => {
    let i = 0;
    while (i < n - 2 && s > xs[i + 1]) i++;
    const hh = xs[i + 1] - xs[i];
    const t = Math.min(Math.max((s - xs[i]) / hh, 0), 1);
    const t2 = t * t;
    const t3 = t2 * t;
-    return (
-      (2 * t3 - 3 * t2 + 1) * ys[i] + (t3 - 2 * t2 + t) * hh * m[i] + (-2 * t3 + 3 * t2) * ys[i + 1] + (t3 - t2) * hh * m[i + 1]
-    );
+    return (2 * t3 - 3 * t2 + 1) * ys[i] + (t3 - 2 * t2 + t) * hh * m[i] + (-2 * t3 + 3 * t2) * ys[i + 1] + (t3 - t2) * hh * m[i + 1];
  };
-  return f;
 }
-const tau = monotone(TAU_KEYS);
-const rate = (s) => (tau(s + 0.01) - tau(s - 0.01)) / 0.02;

-const S_SYNC0 = 29.8;
-const S_SYNC1 = 35.0;
-function hermite(s, s0, y0, m0, s1, y1, m1) {
-  const h = s1 - s0;
-  const t = (s - s0) / h;
-  const t2 = t * t;
-  const t3 = t2 * t;
-  return (2 * t3 - 3 * t2 + 1) * y0 + (t3 - 2 * t2 + t) * h * m0 + (-2 * t3 + 3 * t2) * y1 + (t3 - t2) * h * m1;
+// Shots own their clocks (see story.js). tau = simulation time; bclock = the
+// clock the Earth, sun and X36's place on its orbit follow (== tau in `true` shots).
+const STORY = buildStory({ sec, D });
+const SHOTS = STORY.shots.map((sh) => ({ ...sh, tauF: monotone(sh.tau) }));
+const DUR = STORY.duration;
+const CUTS = SHOTS.slice(1).map((sh) => sh.s0);
+function shotAt(s) {
+  let k = 0;
+  for (let i = 0; i < SHOTS.length; i++) if (s >= SHOTS[i].s0) k = i;
+  return SHOTS[k];
+}
+const tau = (s) => shotAt(s).tauF(s);
+function rate(s) {
+  const sh = shotAt(s);
+  const a = Math.max(sh.s0, s - 0.02);
+  const b = Math.min(sh.s1 - 1e-4, s + 0.02);
+  return (sh.tauF(b) - sh.tauF(a)) / (b - a);
 }
-const BG_RATE = 110;
 function bclock(s) {
-  if (s >= S_SYNC0 && s <= S_SYNC1) return tau(s);
-  if (s < S_SYNC0) {
-    const y1 = tau(S_SYNC0);
-    return hermite(s, 0, y1 - S_SYNC0 * BG_RATE * 1.15, BG_RATE, S_SYNC0, y1, rate(S_SYNC0));
-  }
-  const y0 = tau(S_SYNC1);
-  return hermite(s, S_SYNC1, y0, rate(S_SYNC1), DUR, y0 + (DUR - S_SYNC1) * BG_RATE * 1.2, BG_RATE);
+  const sh = shotAt(s);
+  return sh.mode === 'true' ? sh.tauF(s) : sh.tauF(sh.s0) + (s - sh.s0) * (sh.bgRate || 140);
 }
+// Video time at which simulation time t is shown (skipping the cold open).
 function sOfTau(t) {
-  let lo = 0;
-  let hi = DUR;
-  for (let k = 0; k < 50; k++) {
-    const mid = (lo + hi) / 2;
-    if (tau(mid) < t) lo = mid;
-    else hi = mid;
+  for (let i = SHOTS.length - 1; i >= 1; i--) {
+    const sh = SHOTS[i];
+    const a = sh.tauF(sh.s0);
+    const b = sh.tauF(sh.s1);
+    if (t >= a && t <= b) {
+      let lo = sh.s0;
+      let hi = sh.s1;
+      for (let k = 0; k < 40; k++) {
+        const mid = (lo + hi) / 2;
+        if (sh.tauF(mid) < t) lo = mid;
+        else hi = mid;
+      }
+      return lo;
+    }
  }
-  return lo;
+  return null;
 }

 // ---------------------------------------------------------------------------
@@ -176,64 +167,37 @@ function sOfTau(t) {
 // ---------------------------------------------------------------------------
 const BURNS = D.burns.map((b) => ({ ...b, t: sec(b.t) }));

-// Camera keys, in X36's local frame (R up, T velocity, N orbit normal).
-// dist: metres (or auto = f * separation, floored at min). az: 0 = behind X36
-// looking forward. look: 0 = X36, 1 = Cosmos. earth: pull aim to Earth centre.
-const WIDE = { f: 0, look: 0, earth: 0.86, fov: 40, mag: 0, sun: 0.55 };
-const CAM = [
-  { s: 0.0, ...WIDE, dist: 5.4e7, az: 82, el: 36, trail: 2 },
-  { s: 6.0, ...WIDE, dist: 4.6e7, az: 96, el: 34, trail: 20 },
-  { s: 12.5, ...WIDE, dist: 4.4e7, az: 118, el: 30, trail: 30 },
-  { s: 12.5, cut: true, dist: 6.0e5, f: 2.8, az: 50, el: 38, look: 0.5, earth: 0, fov: 34, mag: 0, trail: 3 },
-  { s: 15.4, dist: 1.6e6, f: 2.8, az: 32, el: 36, look: 0.5, earth: 0, fov: 34, mag: 0, trail: 8 },
-  { s: 18.0, dist: 1.4e6, f: 2.8, az: 26, el: 34, look: 0.5, earth: 0, fov: 34, mag: 0, trail: 12 },
-  { s: 20.4, dist: 4.0e4, f: 2.8, az: 40, el: 32, look: 0.5, earth: 0, fov: 34, mag: 0, trail: 10 },
-  { s: 22.4, dist: 6.5e3, f: 2.4, az: 58, el: 34, look: 0.45, earth: 0, fov: 36, mag: 1, mx: 40, trail: 9 },
-  { s: 26.0, dist: 4.6e3, f: 2.4, az: 76, el: 30, look: 0.5, earth: 0, fov: 36, mag: 1, mx: 40, trail: 9 },
-  { s: 29.7, dist: 2.0e3, f: 2.2, az: 104, el: 24, look: 0.5, earth: 0, fov: 36, mag: 1, mx: 25, trail: 4 },
-  { s: 31.9, dist: 1.0e3, f: 2.2, az: 116, el: 22, look: 0.5, earth: 0, fov: 36, mag: 1, mx: 25, trail: 3 },
-  { s: 31.9, cut: true, dist: 26, f: 0, az: 160, el: 0, look: 0.0, earth: 0, fov: 34, mag: 0, trail: 0.5, comp: 0, pairD: 26, pairTh: 22 },
-  { s: 33.9, dist: 22, f: 0, az: 163, el: 0, look: 0.0, earth: 0, fov: 34, mag: 0, trail: 0.5, comp: 0, pairD: 22, pairTh: 18 },
-  { s: 33.9, cut: true, dist: 1.3e3, f: 2.2, az: 96, el: 18, look: 0.5, earth: 0, fov: 36, mag: 1, mx: 25, trail: 1.6 },
-  { s: 35.6, dist: 1.6e3, f: 2.4, az: 100, el: 22, look: 0.5, earth: 0, fov: 36, mag: 1, mx: 25, trail: 2 },
-  { s: 37.0, dist: 1.2e4, f: 2.8, az: 110, el: 30, look: 0.4, earth: 0, fov: 36, mag: 1, mx: 40, trail: 4 },
-  { s: 39.0, dist: 9.0e5, f: 2.8, az: 60, el: 30, look: 0.5, earth: 0, fov: 34, mag: 0, trail: 30 },
-  { s: 41.2, dist: 2.0e6, f: 2.8, az: 44, el: 30, look: 0.5, earth: 0, fov: 34, mag: 0, trail: 60 },
-  { s: 41.2, cut: true, ...WIDE, dist: 4.8e7, az: 80, el: 34, trail: 60 },
-  { s: 45.0, ...WIDE, dist: 4.2e7, az: 96, el: 32, trail: 60 },
-];
-const CUTS = CAM.filter((k) => k.cut).map((k) => k.s);
 const smooth = (x) => x * x * x * (x * (x * 6 - 15) + 10);
 function camAt(s) {
-  // Keys are grouped into shots at cut keys; interpolation never crosses a cut.
-  let start = 0;
-  for (let k = 1; k < CAM.length; k++) if (CAM[k].cut && s >= CAM[k].s) start = k;
-  let end = CAM.length - 1;
-  for (let k = start + 1; k < CAM.length; k++) if (CAM[k].cut) { end = k - 1; break; }
-  let i = start;
-  while (i < end - 1 && s > CAM[i + 1].s) i++;
-  const a = CAM[i];
-  const b = CAM[Math.min(i + 1, end)];
+  const keys = shotAt(s).cam;
+  let i = 0;
+  while (i < keys.length - 2 && s > keys[i + 1].s) i++;
+  const a = keys[i];
+  const b = keys[Math.min(i + 1, keys.length - 1)];
  const u = b === a ? 0 : smooth(Math.min(Math.max((s - a.s) / (b.s - a.s), 0), 1));
  const lerp = (x, y) => x + (y - x) * u;
+  const lg = (x, y) => Math.exp(lerp(Math.log(x), Math.log(y)));
  const ar = a.aimRel || [0, 0, 0];
  const br = b.aimRel || [0, 0, 0];
  return {
-    dist: Math.exp(lerp(Math.log(a.dist), Math.log(b.dist))),
-    f: lerp(a.f, b.f),
+    frame: a.frame || 'rtn',
+    dist: lg(a.dist, b.dist),
+    f: lerp(a.f || 0, b.f || 0),
    az: lerp(a.az, b.az),
    el: lerp(a.el, b.el),
-    look: lerp(a.look, b.look),
-    earth: lerp(a.earth, b.earth),
+    look: lerp(a.look || 0, b.look || 0),
+    earth: lerp(a.earth || 0, b.earth || 0),
    fov: lerp(a.fov, b.fov),
-    mag: lerp(a.mag, b.mag),
+    mag: lerp(a.mag || 0, b.mag || 0),
+    mx: lg(a.mx || 1, b.mx || 1),
+    rtrail: lerp(a.rtrail || 0, b.rtrail || 0),
+    atrail: lerp(a.atrail || 0, b.atrail || 0),
+    sun: lerp(a.sun || 0, b.sun || 0),
+    vup: lerp(a.vup || 0, b.vup || 0),
    comp: lerp(a.comp ?? 1, b.comp ?? 1),
    pairD: lerp(a.pairD || 0, b.pairD || 0),
    pairTh: lerp(a.pairTh || 0, b.pairTh || 0),
-    mx: Math.exp(lerp(Math.log(a.mx || 1), Math.log(b.mx || 1))),
-    trail: Math.exp(lerp(Math.log(a.trail), Math.log(b.trail))),
    aimRel: [0, 1, 2].map((k) => lerp(ar[k], br[k])),
-    sun: lerp(a.sun || 0, b.sun || 0),
  };
 }

@@ -253,6 +217,13 @@ const viewer = new Cesium.Viewer('globe', {
  msaaSamples: 1,
 });
 const scene = viewer.scene;
+// Motion-blur accumulator: sub-frames are averaged here, above the WebGL canvas.
+const accum = document.createElement('canvas');
+accum.width = W;
+accum.height = H;
+accum.style.cssText = 'position:absolute;inset:0;width:100%;height:100%;visibility:hidden';
+document.getElementById('globe').appendChild(accum);
+const actx = accum.getContext('2d');
 // Night side: NASA Black Marble city lights (keyless GIBS tiles).
 const nightLayer = viewer.imageryLayers.addImageryProvider(new Cesium.UrlTemplateImageryProvider({
  url: 'https://gibs.earthdata.nasa.gov/wmts/epsg3857/best/VIIRS_Black_Marble/default/2016-01-01/GoogleMapsCompatible_Level8/{z}/{y}/{x}.png',
@@ -385,7 +356,7 @@ function project(world) {
  return p;
 }
 const hud = createHud({
-  D, W, H, U, PORTRAIT, sec, rate, sOfTau, sepAt, CA_T, VANTOR_T, BURNS, CUTS, project,
+  D, W, H, U, PORTRAIT, sec, rate, sOfTau, sepAt, CA_T, VANTOR_T, BURNS, CUTS, SHOTS, shotAt, DUR, project,
 });

 // ---------------------------------------------------------------------------
@@ -416,14 +387,24 @@ function eclipseLight(worldPos, sunW) {
  return Math.min(1, Math.max(0, 0.5 + e));
 }

-async function frame(s) {
+// Orbital speed from vis-viva, using each satellite's own SMA (m/s).
+const MU = 3.986004418e14;
+function smaOffsetAt(t) {
+  const arr = D.sma_offset_km;
+  const x = Math.min(Math.max(t / (DT * 10), 0), arr.length - 1);
+  return arr[Math.round(x)] * 1000;
+}
+
+// Set every scene element for video time s. Returns state for the HUD.
+function setState(s) {
+  const sh = shotAt(s);
  const t = tau(s);
  const b = bclock(s);
  const jd = Cesium.JulianDate.addSeconds(Cesium.JulianDate.fromIso8601(D.t0), b, new Cesium.JulianDate());
  Cesium.Transforms.computeTemeToPseudoFixedMatrix(jd, M);
  const cam = camAt(s);

-  // Anchor (X36 at backdrop time) and relative state at simulation time.
+  // Anchor (X36 on the shot's display clock) and relative state at simulation time.
  const A = x36Teme(b);
  const B = basis(A.r, A.v);
  const rel = relAt(t);
@@ -433,25 +414,51 @@ async function frame(s) {
  const TW = toWorld(B.T);
  const NW = toWorld(B.N);
  const sep = v3.distance(x36W, cosW);
+  // Inertial camera basis: X36's frame frozen at the shot start.
+  let cR = RW;
+  let cT = TW;
+  let cN = NW;
+  if (cam.frame === 'inertial') {
+    const A0 = x36Teme(bclock(sh.s0));
+    const B0 = basis(A0.r, A0.v);
+    cR = toWorld(B0.R);
+    cT = toWorld(B0.T);
+    cN = toWorld(B0.N);
+  }

-  // Camera
  const sunW = v3.normalize(Cesium.Simon1994PlanetaryPositions.computeSunPositionInEarthInertialFrame(jd, new v3()), new v3());
  Cesium.Matrix3.multiplyByVector(Cesium.Transforms.computeIcrfToFixedMatrix(jd) || M, sunW, sunW);
  v3.normalize(sunW, sunW);
-  // Camera orbits a pivot on the X36 -> Cosmos line; aimRel only tilts the gaze.
-  const pivot = v3.lerp(x36W, cosW, cam.look, new v3());
+
+  // Frame on Cosmos's guiding centre (its loop averaged over one orbit) and the
+  // loop's size: both change slowly, so the shot doesn't pump every orbit.
+  const P = 5730;
+  const gc = [0, 0, 0];
+  const relS = [];
+  for (let k = 0; k < 16; k++) {
+    const rk = relAt(t - P / 2 + (k + 0.5) * (P / 16));
+    relS.push(rk);
+    gc[0] += rk[0] / 16;
+    gc[1] += rk[1] / 16;
+    gc[2] += rk[2] / 16;
+  }
+  let loop = 0;
+  for (const rk of relS) loop = Math.max(loop, Math.hypot(rk[0] - gc[0], rk[1] - gc[1], rk[2] - gc[2]));
+  const gcW = toWorld(place(A.r, B, gc));
+  const sepG = v3.distance(x36W, gcW) + loop;
+  const pivot = v3.lerp(x36W, gcW, cam.look, new v3());
  v3.lerp(pivot, v3.ZERO, cam.earth, pivot);
  const aim = v3.clone(pivot);
  v3.add(aim, v3.multiplyByScalar(RW, cam.aimRel[0], new v3()), aim);
  v3.add(aim, v3.multiplyByScalar(TW, cam.aimRel[1], new v3()), aim);
  v3.add(aim, v3.multiplyByScalar(NW, cam.aimRel[2], new v3()), aim);
-  const dist = Math.max(cam.dist, cam.f * sep) * (PORTRAIT && cam.earth > 0.5 ? 0.74 : 1);
+  const dist = Math.max(cam.dist, cam.f * sepG) * (PORTRAIT && cam.earth > 0.5 ? 0.74 : 1);
  const az = Cesium.Math.toRadians(cam.az);
  const el = Cesium.Math.toRadians(cam.el);
  const off = new v3();
-  v3.add(off, v3.multiplyByScalar(TW, -Math.cos(el) * Math.cos(az), new v3()), off);
-  v3.add(off, v3.multiplyByScalar(NW, Math.cos(el) * Math.sin(az), new v3()), off);
-  v3.add(off, v3.multiplyByScalar(RW, Math.sin(el), new v3()), off);
+  v3.add(off, v3.multiplyByScalar(cT, -Math.cos(el) * Math.cos(az), new v3()), off);
+  v3.add(off, v3.multiplyByScalar(cN, Math.cos(el) * Math.sin(az), new v3()), off);
+  v3.add(off, v3.multiplyByScalar(cR, Math.sin(el), new v3()), off);
  if (cam.sun > 0) {
    v3.normalize(v3.add(v3.multiplyByScalar(off, 1 - cam.sun, off), v3.multiplyByScalar(sunW, cam.sun, new v3()), off), off);
  }
@@ -471,20 +478,23 @@ async function frame(s) {
  const minR = 6.371e6 + 1.2e5;
  if (v3.magnitude(camPos) < minR) v3.multiplyByScalar(v3.normalize(camPos, camPos), minR, camPos);
  const dir = v3.normalize(v3.subtract(aim, camPos, new v3()), new v3());
-  let right = v3.normalize(v3.cross(dir, RW, new v3()), new v3());
+  // Up: local zenith; in portrait chase shots, the direction of flight (so the
+  // pair travels up the tall frame and Earth's limb runs down one side).
+  const vup = PORTRAIT ? cam.vup : 0;
+  const upHint = v3.normalize(v3.lerp(RW, TW, vup, new v3()), new v3());
+  let right = v3.normalize(v3.cross(dir, upHint, new v3()), new v3());
  let up = v3.cross(right, dir, new v3());
  {
-    // Composition: put the aim point right of centre in 16:9 (the caption
-    // column is on the left); portrait keeps it centred between the text bands.
+    // Composition: put the aim point right of centre in 16:9 (caption column on the left).
    const fovR = Cesium.Math.toRadians(PORTRAIT ? cam.fov * 1.55 : cam.fov);
    const aspect = W / H;
    const tanH = PORTRAIT ? Math.tan(fovR / 2) * aspect : Math.tan(fovR / 2);
    const tanV = PORTRAIT ? Math.tan(fovR / 2) : Math.tan(fovR / 2) / aspect;
-    const ndcX = (PORTRAIT ? 0 : 0.2) * cam.comp;
-    const ndcY = (PORTRAIT ? -0.02 : -0.06) * cam.comp;
+    const ndcX = (PORTRAIT ? 0 : 0.18) * cam.comp;
+    const ndcY = (PORTRAIT ? -0.04 : 0.06) * cam.comp;
    v3.normalize(v3.add(v3.add(dir, v3.multiplyByScalar(right, -ndcX * tanH, new v3()), new v3()),
      v3.multiplyByScalar(up, -ndcY * tanV, new v3()), new v3()), dir);
-    right = v3.normalize(v3.cross(dir, RW, new v3()), new v3());
+    right = v3.normalize(v3.cross(dir, upHint, new v3()), new v3());
    up = v3.cross(right, dir, new v3());
  }
  scene.camera.setView({ destination: camPos, orientation: { direction: dir, up } });
@@ -499,22 +509,14 @@ async function frame(s) {
  }
  scene.camera.frustum.near = Math.max(0.2, Math.min(dist * 0.02, 1000));

-  // Models: attitude, magnification, lighting
+  // Models: attitude, fixed per-shot enlargement, lighting
  const camDistX = v3.distance(camPos, x36W);
  const camDistC = v3.distance(camPos, cosW);
-  const pxPerRad = (PORTRAIT ? W : W) / (2 * Math.tan(scene.camera.frustum.fov / 2));
-  const targetPx = 110 * U; // magnified apparent size
-  const magFor = (d, size) => Math.max(1, (targetPx * d) / (pxPerRad * size));
-  // One fixed enlargement per beat (keyed), so the on-screen factor holds still.
-  const rawMag = cam.mag > 0.5 ? cam.mx : 1;
-  const MAG_MAX = 150;
-  const mag = rawMag;
-  void magFor;
-  const nearScale = Math.min(1, Math.max(0, cam.mag * 2));
-  mX36.show = (cam.mag > 0.01 && rawMag <= MAG_MAX) || camDistX < 3000;
-  mCos.show = (cam.mag > 0.01 && rawMag <= MAG_MAX) || camDistC < 6000;
+  const pxPerRad = W / (2 * Math.tan(scene.camera.frustum.fov / 2));
+  const mag = cam.mag > 0.5 ? cam.mx : 1;
+  mX36.show = cam.mag > 0.01 || camDistX < 3000;
+  mCos.show = cam.mag > 0.01 || camDistC < 6000;
  mX36.modelMatrix = modelMatrix(x36W, TW, RW, mag);
-  // Cosmos points its sensor at X36 when close, otherwise flies prograde.
  const toX = v3.normalize(v3.subtract(x36W, cosW, new v3()), new v3());
  const w = Math.min(1, Math.max(0, (60e3 - sep) / 40e3));
  const cx = v3.normalize(v3.lerp(TW, toX, w, new v3()), new v3());
@@ -522,69 +524,83 @@ async function frame(s) {
  mCos.modelMatrix = modelMatrix(cosW, cx, cy, mag);
  const lx = eclipseLight(x36W, sunW);
  const lc = eclipseLight(cosW, sunW);
-  // In Earth's shadow a dim blue fill keeps the shapes legible.
  const lightFor = (l) => new v3(0.6 + (2.3 - 0.6) * l, 0.66 + (2.3 - 0.66) * l, 0.92 + (2.3 - 0.92) * l);
  mX36.lightColor = lightFor(lx);
  mCos.lightColor = lightFor(lc);

-  // Glows: shown when the model is too small to read.
+  // Glows: always on as "lights"; they shrink when the model is big enough to read.
  const pxX = (3.25 * mag * pxPerRad) / camDistX;
  const pxC = (3.6 * mag * pxPerRad) / camDistC;
  bX36.position = x36W;
  bCos.position = cosW;
-  bX36.scale = (pxX > 24 ? 0.14 : 0.42) * U;
-  bCos.scale = (pxC > 24 ? 0.14 : 0.42) * U;
-  bX36.color = Cesium.Color.WHITE.withAlpha(pxX > 40 ? 0 : 1);
-  bCos.color = Cesium.Color.WHITE.withAlpha(pxC > 40 ? 0 : 1);
+  bX36.scale = (pxX > 24 ? 0.16 : 0.5) * U;
+  bCos.scale = (pxC > 24 ? 0.16 : 0.5) * U;
+  bX36.color = Cesium.Color.WHITE.withAlpha(pxX > 60 ? 0.35 : 1);
+  bCos.color = Cesium.Color.WHITE.withAlpha(pxC > 60 ? 0.35 : 1);

  // Burn flare
  let flare = 0;
  for (const bn of BURNS) {
    const sb = sOfTauCached(bn.t);
+    if (sb === null) continue;
    const k = (s - sb) / 0.9;
    if (k > -0.08 && k < 1) flare = Math.max(flare, k < 0 ? 1 + k / 0.08 : (1 - k) ** 1.6);
  }
  bBurn.position = cosW;
-  bBurn.scale = flare * 0.9 * U;
+  bBurn.scale = flare * 1.1 * U;
  bBurn.color = Cesium.Color.WHITE.withAlpha(flare);

-  // Trails and reference geometry
+  // Trails
  clearDynamic();
-  // X36 orbit ring (inertial, at the anchor epoch); fades out up close.
-  const ringA = Math.min(1, Math.max(0, (camDistX - 1.5e4) / 6e4));
-  if (ringA > 0.01) {
-    const P = 5730;
-    const pts = [];
-    const cols = [];
-    const n = 240;
-    for (let k = 0; k <= n; k++) {
-      const tt = b - P + (k / n) * P;
-      pts.push(toWorld(x36Teme(tt).r));
-      const a = 0.06 + 0.5 * (k / n) ** 3;
-      cols.push(COL_X36.withAlpha(a * ringA));
+  // Orbit trails (inertial): where each satellite has actually flown in the last
+  // `atrail` minutes. Only meaningful when the shot runs on one clock.
+  if (cam.atrail > 0 && sh.mode === 'true') {
+    const span = cam.atrail * 60;
+    const n = Math.min(400, Math.max(40, Math.round(span / 15)));
+    for (const which of ['x36', 'cos']) {
+      const pts = [];
+      const cols = [];
+      const col = which === 'x36' ? COL_X36 : COL_COS;
+      for (let k = 0; k <= n; k++) {
+        const tt = t - span + (k / n) * span;
+        if (tt < 0) continue;
+        const Ak = x36Teme(tt);
+        const p = which === 'x36' ? Ak.r : place(Ak.r, basis(Ak.r, Ak.v), relAt(tt));
+        pts.push(toWorld(p));
+        cols.push(col.withAlpha(0.02 + 0.8 * (k / n) ** 2.2));
+      }
+      pts.push(which === 'x36' ? x36W : cosW);
+      cols.push(col.withAlpha(0.85));
+      polyline(pts, cols, which === 'x36' ? 3 : 3);
    }
-    polyline(pts, cols, 1.6);
  }
-  // Cosmos relative trail, expressed in the current anchor frame
-  {
-    const span = cam.trail * 3600;
-    const n = Math.min(900, Math.max(60, Math.round(span / 45)));
+  // Cosmos relative trail (its path as seen from X36), in the current anchor frame
+  if (cam.rtrail > 0) {
+    const span = cam.rtrail * 3600;
+    const n = Math.min(1200, Math.max(60, Math.round(span / 40)));
    const pts = [];
    const cols = [];
    for (let k = 0; k <= n; k++) {
      const tt = t - span + (k / n) * span;
      if (tt < 0) continue;
      pts.push(toWorld(place(A.r, B, relAt(tt))));
-      cols.push(COL_COS.withAlpha(0.04 + 0.92 * (k / n) ** 1.8));
+      cols.push(COL_COS.withAlpha(0.05 + 0.9 * (k / n) ** 1.6));
    }
    pts.push(cosW);
    cols.push(COL_COS.withAlpha(1));
-    polyline(pts, cols, 2.4);
+    polyline(pts, cols, 2.6);
  }
-  // Separation line when the pair is within view range
-  if (sep < 900e3) {
-    const a = Math.min(1, (900e3 - sep) / 200e3) * 0.55;
-    polyline([x36W, cosW], [Cesium.Color.WHITE.withAlpha(a * 0.25), Cesium.Color.WHITE.withAlpha(a * 0.25)], 1);
+  // X36 orbit ring for wide shots (inertial, at the anchor epoch)
+  const ringA = Math.min(1, Math.max(0, (camDistX - 1.5e4) / 6e4)) * (cam.atrail > 0 && sh.mode === 'true' ? 0.35 : 1);
+  if (ringA > 0.01) {
+    const P = 5730;
+    const pts = [];
+    const cols = [];
+    for (let k = 0; k <= 240; k++) {
+      pts.push(toWorld(x36Teme(b - P + (k / 240) * P).r));
+      cols.push(COL_X36.withAlpha((0.05 + 0.3 * (k / 240) ** 2) * ringA));
+    }
+    polyline(pts, cols, 1.4);
  }
  // RIC reference rings (orbital plane) during proximity
  const gridA = Math.min(1, Math.max(0, (8e3 - Math.max(sep, camDistX)) / 3e3)) * (cam.mag > 0.4 ? 1 : 0.35);
@@ -597,31 +613,54 @@ async function frame(s) {
        const p = v3.add(x36W, v3.multiplyByScalar(RW, r * Math.sin(a), new v3()), new v3());
        v3.add(p, v3.multiplyByScalar(TW, r * Math.cos(a), new v3()), p);
        pts.push(p);
-        cols.push(Cesium.Color.WHITE.withAlpha(0.16 * gridA));
+        cols.push(Cesium.Color.WHITE.withAlpha(0.14 * gridA));
      }
      polyline(pts, cols, 1);
    }
-    const ax = (vec, len, col) => polyline(
-      [v3.add(x36W, v3.multiplyByScalar(vec, -len, new v3()), new v3()), v3.add(x36W, v3.multiplyByScalar(vec, len, new v3()), new v3())],
-      [col.withAlpha(0), col.withAlpha(0)], 1,
-    );
-    polyline([x36W, v3.add(x36W, v3.multiplyByScalar(TW, 2600, new v3()), new v3())], [COL_X36.withAlpha(0.5 * gridA), COL_X36.withAlpha(0)], 1.5);
-    polyline([x36W, v3.add(x36W, v3.multiplyByScalar(RW, 1400, new v3()), new v3())], [Cesium.Color.WHITE.withAlpha(0.4 * gridA), Cesium.Color.WHITE.withAlpha(0)], 1.5);
-    void ax;
  }

-  hud.update(s, t, b, { x36W, cosW, RW, TW, NW, rel, sep, mag, gridA, lx, camDistX, jd });
-  // Render; re-render only while imagery is still streaming in.
-  scene.render(jd);
-  // Bounded: parents stand in for children still streaming; sequential frames converge.
-  for (let k = 0; k < SETTLE && !(globe.tilesLoaded && mX36.ready && mCos.ready); k++) {
-    await new Promise((r) => setTimeout(r, 60));
-    scene.render(jd);
+  // Speeds: X36 from its state vector; Cosmos by vis-viva with its own SMA.
+  const rC = v3.magnitude(place(A.r, B, rel));
+  const aC = D.a_km * 1000 + smaOffsetAt(t);
+  const vC = Math.sqrt(MU * (2 / rC - 1 / aC));
+  const vXv = Math.sqrt(MU * (2 / v3.magnitude(A.r) - 1 / (D.a_km * 1000)));
+  const r1 = relAt(t + 30);
+  const r0 = relAt(t - 30);
+  const relSpeed = Math.hypot(r1[0] - r0[0], r1[1] - r0[1], r1[2] - r0[2]) / 60;
+
+  return { sh, t, b, jd, x36W, cosW, RW, TW, NW, rel, sep, mag, gridA, lx, camDistX, vX: vXv, vC, relSpeed };
+}
+
+async function frame(s) {
+  const sh = shotAt(s);
+  const K = Math.max(1, (sh.blur | 0) % 2 ? sh.blur | 0 : (sh.blur | 0) + 1);
+  globe.maximumScreenSpaceError = K > 1 ? 4 : 2.2;
+  const mid = Math.floor(K / 2);
+  let hudState = null;
+  accum.style.visibility = K > 1 ? 'visible' : 'hidden';
+  for (let k = 0; k < K; k++) {
+    // Sub-frames spread across the shutter, clamped inside the shot.
+    const sk = K === 1 ? s : Math.min(sh.s1 - 1e-4, Math.max(sh.s0, s + ((k + 0.5) / K - 0.5) * (SHUTTER / FPS)));
+    const st = setState(k === mid ? s : sk);
+    scene.render(st.jd);
+    if (k === 0 || K === 1) {
+      for (let j = 0; j < SETTLE && !(globe.tilesLoaded && mX36.ready && mCos.ready); j++) {
+        await new Promise((r) => setTimeout(r, 60));
+        scene.render(st.jd);
+      }
+    }
+    if (k === mid) {
+      hud.update(s, st.t, st.b, st);
+      hudState = st;
+    }
+    if (K > 1) {
+      actx.globalAlpha = 1 / (k + 1);
+      actx.drawImage(viewer.canvas, 0, 0, W, H);
+    }
  }
  const gl = scene.context._gl;
  gl.readPixels(0, 0, 1, 1, gl.RGBA, gl.UNSIGNED_BYTE, new Uint8Array(4));
-  const dbg = { pX: Cesium.SceneTransforms.worldToWindowCoordinates(scene, x36W), dX: v3.distance(scene.camera.positionWC, x36W), ang: Cesium.Math.toDegrees(v3.angleBetween(scene.camera.directionWC, v3.subtract(x36W, scene.camera.positionWC, new v3()))), mshow: mX36.show, mm: Cesium.Matrix4.getTranslation(mX36.modelMatrix, new v3()), x36W };
-  return { dbg, s, t, b, sep, mag, camR: v3.magnitude(camPos), dist, fov: scene.camera.frustum.fov, fovy: scene.camera.frustum.fovy, aspect: scene.camera.frustum.aspectRatio };
+  return { s, t: hudState.t, sep: hudState.sep, mag: hudState.mag, shot: sh.id, K };
 }

 const sOfTauMemo = new Map();
@@ -631,4 +670,4 @@ function sOfTauCached(t) {
 }

 await document.fonts.ready;
-window.rpo = { frame, tau, bclock, duration: DUR, ready: true, CAM };
+window.rpo = { frame, tau, bclock, duration: DUR, ready: true, SHOTS };
@@ -0,0 +1,123 @@
+// v4 storyboard: a list of shots separated by hard cuts. Each shot owns its
+// clock. `true` shots run Earth, sun, both satellites and the camera on one
+// physical clock (a real time-lapse: day and night cycle, the ground rushes
+// by). `ff` (fast-forward) shots are too fast for that to read, so the Earth
+// and X36's place on its orbit advance on a slow display clock while the
+// relative motion runs at the stated rate; they carry a FAST-FORWARD badge.
+//
+// Camera keys use X36's local frame (R up, T velocity, N orbit normal):
+//   dist (m) or f × separation; az 0 = behind X36 looking forward; el up;
+//   look 0 = X36 … 1 = Cosmos; earth pulls the aim toward Earth's centre;
+//   frame 'inertial' freezes the basis at the shot start (wide shots);
+//   vup (portrait) rolls the camera so the direction of flight points up;
+//   rtrail = Cosmos relative-path trail (hours); atrail = orbit trails (min);
+//   mag/mx = fixed model enlargement; pairD/pairTh = pair-locked true-size cam.
+
+export function buildStory({ sec, D }) {
+  const CA = sec(D.ca.t);
+  const M = 60;
+  const iso = (s) => sec(s);
+  const WIDE = { frame: 'inertial', look: 0, earth: 0.86, f: 0, fov: 40, mag: 0, sun: 0.5 };
+
+  const shots = [
+    {
+      id: 'hook', mode: 'true', s0: 0, s1: 3.6, blur: 2,
+      tau: [[0, CA - 7 * M], [3.6, CA - 2 * M]],
+      cam: [
+        { s: 0, dist: 1500, f: 2.6, az: 118, el: 18, look: 0.5, fov: 34, mag: 1, mx: 25, rtrail: 1.2, atrail: 4, vup: 1 },
+        { s: 3.6, dist: 1300, f: 2.4, az: 104, el: 14, look: 0.5, fov: 34, mag: 1, mx: 25, rtrail: 1.2, atrail: 4, vup: 1 },
+      ],
+    },
+    {
+      id: 'climb', mode: 'true', s0: 3.6, s1: 10.6, blur: 3,
+      tau: [[3.6, iso('2026-09-30T07:20:00Z')], [10.6, iso('2026-09-30T12:40:00Z')]],
+      cam: [
+        { s: 3.6, ...WIDE, dist: 3.1e7, az: 86, el: 38, atrail: 70, rtrail: 0 },
+        { s: 10.6, ...WIDE, dist: 2.6e7, az: 104, el: 34, atrail: 70, rtrail: 0 },
+      ],
+    },
+    {
+      id: 'lap', mode: 'ff', s0: 10.6, s1: 14.6, blur: 1, bgRate: 260,
+      tau: [[10.6, iso('2026-09-30T13:00:00Z')], [14.6, iso('2026-10-11T23:40:00Z')]],
+      cam: [
+        { s: 10.6, ...WIDE, dist: 2.7e7, az: 100, el: 36, atrail: 0, rtrail: 30 },
+        { s: 14.6, ...WIDE, dist: 2.3e7, az: 124, el: 30, atrail: 0, rtrail: 30 },
+      ],
+    },
+    {
+      id: 'drop', mode: 'true', s0: 14.6, s1: 19.6, blur: 4,
+      tau: [[14.6, iso('2026-10-12T00:00:00Z')], [19.6, iso('2026-10-12T03:30:00Z')]],
+      cam: [
+        { s: 14.6, dist: 2.4e5, f: 2.6, az: 62, el: 28, look: 0.5, fov: 36, mag: 0, rtrail: 3, atrail: 20, vup: 1 },
+        { s: 17.0, dist: 3.0e5, f: 2.6, az: 48, el: 30, look: 0.5, fov: 36, mag: 0, rtrail: 4, atrail: 20, vup: 1 },
+        { s: 19.6, dist: 4.0e5, f: 2.6, az: 34, el: 32, look: 0.5, fov: 36, mag: 0, rtrail: 4, atrail: 20, vup: 1 },
+      ],
+    },
+    {
+      id: 'close', mode: 'ff', s0: 19.6, s1: 23.2, blur: 1, bgRate: 140,
+      tau: [[19.6, iso('2026-10-12T03:40:00Z')], [21.4, iso('2026-10-15T06:00:00Z')], [23.2, iso('2026-10-16T07:00:00Z')]],
+      cam: [
+        { s: 19.6, dist: 1.0e6, f: 2.8, az: 30, el: 34, look: 0.5, fov: 34, mag: 0, rtrail: 30, atrail: 0, vup: 1 },
+        { s: 23.2, dist: 2.0e4, f: 2.8, az: 46, el: 34, look: 0.5, fov: 34, mag: 0, rtrail: 30, atrail: 0, vup: 1 },
+      ],
+    },
+    {
+      id: 'dance', mode: 'true', s0: 23.2, s1: 29.2, blur: 5,
+      tau: [[23.2, iso('2026-10-16T07:10:00Z')], [29.2, iso('2026-10-16T12:10:00Z')]],
+      cam: [
+        { s: 23.2, dist: 5.5e3, f: 1.7, az: 62, el: 30, look: 0.5, fov: 38, mag: 1, mx: 40, rtrail: 3, atrail: 1.2, vup: 1 },
+        { s: 29.2, dist: 5.0e3, f: 1.7, az: 84, el: 24, look: 0.5, fov: 38, mag: 1, mx: 40, rtrail: 3, atrail: 1.2, vup: 1 },
+      ],
+    },
+    {
+      id: 'dance-ff', mode: 'ff', s0: 29.2, s1: 31.2, blur: 1, bgRate: 140,
+      tau: [[29.2, iso('2026-10-16T12:20:00Z')], [31.2, iso('2026-10-17T22:20:00Z')]],
+      cam: [
+        { s: 29.2, dist: 4.5e3, f: 1.7, az: 70, el: 40, look: 0.5, fov: 38, mag: 1, mx: 40, rtrail: 12, atrail: 0, vup: 1 },
+        { s: 31.2, dist: 3.4e3, f: 1.7, az: 92, el: 34, look: 0.5, fov: 38, mag: 1, mx: 40, rtrail: 12, atrail: 0, vup: 1 },
+      ],
+    },
+    {
+      id: 'approach', mode: 'true', s0: 31.2, s1: 35.4, blur: 4,
+      tau: [[31.2, iso('2026-10-17T22:30:00Z')], [33.4, CA - 40 * M], [35.4, CA - 4 * M]],
+      cam: [
+        { s: 31.2, dist: 3.0e3, f: 1.7, az: 96, el: 26, look: 0.5, fov: 38, mag: 1, mx: 30, rtrail: 3, atrail: 1.5, vup: 1 },
+        { s: 35.4, dist: 1.2e3, f: 2.2, az: 112, el: 18, look: 0.5, fov: 36, mag: 1, mx: 25, rtrail: 1.6, atrail: 1.5, vup: 1 },
+      ],
+    },
+    {
+      id: 'ca', mode: 'true', s0: 35.4, s1: 37.4, blur: 2,
+      tau: [[35.4, CA - 4 * M], [37.4, CA + 1.5 * M]],
+      cam: [
+        { s: 35.4, dist: 26, az: 160, el: 0, look: 0, fov: 34, mag: 0, rtrail: 0.4, atrail: 0.6, comp: 0, pairD: 26, pairTh: 22 },
+        { s: 37.4, dist: 22, az: 163, el: 0, look: 0, fov: 34, mag: 0, rtrail: 0.4, atrail: 0.6, comp: 0, pairD: 22, pairTh: 18 },
+      ],
+    },
+    {
+      id: 'sunrise', mode: 'true', s0: 37.4, s1: 40.0, blur: 2,
+      tau: [[37.4, CA + 2 * M], [40.0, CA + 27 * M]],
+      cam: [
+        { s: 37.4, dist: 1.3e3, f: 2.2, az: 96, el: 16, look: 0.5, fov: 36, mag: 1, mx: 25, rtrail: 1.6, atrail: 1.5, vup: 1 },
+        { s: 40.0, dist: 2.2e3, f: 2.4, az: 104, el: 22, look: 0.5, fov: 36, mag: 1, mx: 25, rtrail: 2, atrail: 1.5, vup: 1 },
+      ],
+    },
+    {
+      id: 'leave', mode: 'ff', s0: 40.0, s1: 44.0, blur: 1, bgRate: 140,
+      tau: [[40.0, CA + 30 * M], [42.0, iso('2026-10-19T08:00:00Z')], [44.0, iso('2026-10-21T12:00:00Z')]],
+      cam: [
+        { s: 40.0, dist: 1.2e4, f: 2.8, az: 110, el: 30, look: 0.4, fov: 36, mag: 1, mx: 40, rtrail: 8, atrail: 0, vup: 1 },
+        { s: 42.0, dist: 4.0e5, f: 2.8, az: 70, el: 30, look: 0.5, fov: 34, mag: 0, rtrail: 30, atrail: 0, vup: 1 },
+        { s: 44.0, dist: 1.6e6, f: 2.8, az: 44, el: 30, look: 0.5, fov: 34, mag: 0, rtrail: 60, atrail: 0, vup: 1 },
+      ],
+    },
+    {
+      id: 'end', mode: 'true', s0: 44.0, s1: 48.5, blur: 1,
+      tau: [[44.0, iso('2026-10-21T12:00:00Z')], [48.5, iso('2026-10-21T14:00:00Z')]],
+      cam: [
+        { s: 44.0, ...WIDE, dist: 4.6e7, az: 82, el: 34, atrail: 60, rtrail: 0 },
+        { s: 48.5, ...WIDE, dist: 4.2e7, az: 96, el: 32, atrail: 60, rtrail: 0 },
+      ],
+    },
+  ];
+  return { shots, duration: 48.5 };
+}
@@ -0,0 +1,195 @@
+ICEYE-X36
+1 59103U 24043F   26086.28993682  .00004707  00000+0  32592-3 0  9991
+2 59103  97.8231 223.0188 0005114 225.4450 134.6360 15.06153609112819
+ICEYE-X36
+1 59103U 24043F   26158.68825802  .00004079  00000+0  27826-3 0  9999
+2 59103  97.8355 296.5937 0005746   7.3897 352.7413 15.06793192123716
+ICEYE-X36
+1 59103U 24043F   26159.35233280  .00003366  00000+0  23040-3 0  9999
+2 59103  97.8353 297.2694 0005687   4.3753 355.7522 15.06796494123817
+ICEYE-X36
+1 59103U 24043F   26166.92262582  .00003618  00000+0  24691-3 0  9990
+2 59103  97.8373 304.9710 0005108 336.3826  23.7165 15.06858602124952
+ICEYE-X36
+1 59103U 24043F   26255.14828070  .00003049  00000-0  20468-3 0  9990
+2 59103  97.8486  34.8692 0006466  36.6781 323.4888 15.07597002138247
+ICEYE-X36
+1 59103U 24043F   26260.59073212  .00003209  00000-0  21497-3 0  9996
+2 59103  97.8501  40.4232 0006153  21.4151 338.7333 15.07633492139063
+ICEYE-X36
+1 59103U 24043F   26261.71902949  .00002764  00000-0  18576-3 0  9998
+2 59103  97.8500  41.5746 0006060  18.1231 342.0211 15.07639150139232
+ICEYE-X36
+1 59103U 24043F   26262.78095287  .00002216  00000-0  14977-3 0  9997
+2 59103  97.8499  42.6583 0005964  14.9606 345.1797 15.07643239139395
+ICEYE-X36
+1 59103U 24043F   26263.57739316  .00002113  00000-0  14303-3 0  9992
+2 59103  97.8498  43.4711 0005895  12.3871 347.7500 15.07646792139516
+ICEYE-X36
+1 59103U 24043F   26264.30746210  .00001920  00000-0  13036-3 0  9992
+2 59103  97.8497  44.2161 0005836   9.7865 350.3475 15.07649397139628
+ICEYE-X36
+1 59103U 24043F   26265.03752949  .00001861  00000-0  12644-3 0  9997
+2 59103  97.8497  44.9611 0005772   7.0979 353.0329 15.07652335139737
+ICEYE-X36
+1 59103U 24043F   26266.36492184  .00002136  00000-0  14447-3 0  9995
+2 59103  97.8497  46.3158 0005664   1.7767 358.3479 15.07658162139935
+ICEYE-X36
+1 59103U 24043F   26266.82950772  .00002606  00000-0  17530-3 0  9996
+2 59103  97.8498  46.7899 0005624 359.8800   0.2424 15.07661498140002
+ICEYE-X36
+1 59103U 24043F   26268.55510567  .00003708  00000-0  24744-3 0  9991
+2 59103  97.8503  48.5513 0005525 352.8204   7.2943 15.07672947140265
+ICEYE-X36
+1 59103U 24043F   26269.55063681  .00004055  00000-0  27015-3 0  9992
+2 59103  97.8507  49.5673 0005452 348.1373  11.9725 15.07679449140412
+ICEYE-X36
+1 59103U 24043F   26270.28068919  .00004003  00000-0  26673-3 0  9995
+2 59103  97.8511  50.3126 0005443 345.0274  15.0791 15.07685221140521
+ICEYE-X36
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+2 68764  97.7950  62.0685 0006126 358.3927   1.7279 15.06174058 26594
+COSMOS 2614
+1 68764U 26083K   26284.73872464  .00003394  00000-0  23608-3 0  9994
+2 68764  97.7953  63.0758 0006038 354.2947   5.8210 15.06181438 26745
+COSMOS 2614
+1 68764U 26083K   26285.33663588  .00002938  00000-0  20497-3 0  9992
+2 68764  97.7955  63.6805 0005996 352.3742   7.7392 15.06183389 26839
+COSMOS 2614
+1 68764U 26083K   26286.66532086  .00002813  00000-0  19638-3 0  9994
+2 68764  97.7961  65.0244 0005880 348.3702  11.7388 15.06191524 27035
+COSMOS 2614
+1 68764U 26083K   26287.66183042  .00002453  00000-0  17181-3 0  9990
+2 68764  97.7964  66.0323 0005781 345.4457  14.6603 15.06196416 27185
+COSMOS 2614
+1 68764U 26083K   26288.72477090  .00002195  00000-0  15420-3 0  9994
+2 68764  97.7966  67.1075 0005667 342.3215  17.7813 15.06201050 27340
+COSMOS 2614
+1 68764U 26083K   26288.92407169  .00002230  00000+0  15655-3 0  9995
+2 68764  97.7966  67.3090 0005644 341.7157  18.3866 15.06202253 27376
+COSMOS 2614
+1 68764U 26083K   26289.65484094  .00002125  00000-0  14940-3 0  9998
+2 68764  97.7966  68.0482 0005563 339.4496  20.6506 15.06205312 27487
+COSMOS 2614
+1 68764U 26083K   26290.31917500  .00002186  00000-0  15354-3 0  9993
+2 68764  97.7966  68.7201 0005497 337.3105  22.7878 15.06208668 27586
+COSMOS 2614
+1 68764U 26083K   26291.64783982  .00002164  00000-0  15203-3 0  9994
+2 68764  97.7965  70.0640 0005355 332.8273  27.2673 15.06214376 27785
+COSMOS 2614
+1 68764U 26083K   26292.31217072  .00002061  00000-0  14497-3 0  9991
+2 68764  97.7963  70.7359 0005299 330.3334  29.7591 15.06216680 27882
+COSMOS 2614
+1 68764U 26083K   26293.30866468  .00001850  00000-0  13056-3 0  9995
+2 68764  97.7964  71.7438 0005338 325.3729  34.7149 15.06219571 28033
+COSMOS 2614
+1 68764U 26083K   26294.63732004  .00001699  00000-0  12027-3 0  9998
+2 68764  97.7965  73.0877 0005253 320.1245  39.9595 15.06223911 28235
+COSMOS 2614
+1 68764U 26083K   26295.63380879  .00001522  00000-0  10820-3 0  9992
+2 68764  97.7961  74.0956 0005110 316.0960  43.9860 15.06227146 28380
+COSMOS 2614
+1 68764U 26083K   26296.23170105  .00001454  00000-0  10359-3 0  9999
+2 68764  97.7961  74.7003 0005105 313.2849  46.7951 15.06228985 28473
+COSMOS 2614
+1 68764U 26083K   26297.29461942  .00001283  00000-0  91891-4 0  9999
+2 68764  97.7961  75.7755 0005105 308.3285  51.7482 15.06231680 28636
+COSMOS 2614
+1 68764U 26083K   26298.68969847  .00001285  00000-0  92040-4 0  9999
+2 68764  97.7970  77.1870 0005106 302.6161  57.4572 15.06234669 28847
+COSMOS 2614
+1 68764U 26083K   26299.28758840  .00001215  00000-0  87210-4 0  9991
+2 68764  97.7970  77.7918 0005096 299.9236  60.1484 15.06235866 28938
@@ -0,0 +1,28 @@
+# TLE/OMM sources (collected 2026-11-08)
+
+Files: `<norad>.tle` (3-line TLEs, sorted by epoch, deduplicated on numeric element content, checksums verified),
+`<norad>.omm.json` (full Space-Track OMM records from OMPub/RSO), `index.csv` (epoch, lines, and every source that carried each element set).
+All content is untrusted downloaded data; nothing from it was executed.
+
+## Worked
+1. **OMPub/RSO "Orbital Witness" daily archive** (main source; one element set per object per day, the latest Space-Track GP_HISTORY row each day).
+   Ledger: https://raw.githubusercontent.com/OMPub/RSO/node/ledger.json
+   Bundles: https://github.com/OMPub/RSO/releases/download/rso-archive-YYYY-MM-DD/rso-archive-YYYY-MM-DD.tar.gz (catalog.json.gz inside)
+   Downloaded 2026-09-18 through 2026-10-27. Source tag in index.csv: `OMPub_RSO:<archive date>`. Found through KeepTrack's public OpenAPI (`/v4/rso/{date}` proxies these releases).
+2. **jazzpi/ssa**, `data/cosmos-2612-iceye-x36.csv` (Space-Track OMM CSV with TLE lines; epochs 2026-10-16 to 2026-10-19, several per day, including revised re-issues of the same epoch).
+   https://raw.githubusercontent.com/jazzpi/ssa/HEAD/data/cosmos-2612-iceye-x36.csv
+3. Single snapshots found in other GitHub repos (searched across full git history):
+   - code-lab-org/tatc `docs/validation/socrates_2026-10-25.tle` (59103, epoch 2026-10-24)
+   - Atharvchaskar008/EDITH `deploy/showcase/runs/20261009T2252Z/catalog.json`, `addons/a_history/out/catalog_enriched.json` (epochs 2026-10-08/09)
+   - shishird-03/Orbitguard `data/catalog.tle` (epochs 2026-10-15)
+   - Out of window (earlier in 2026): Proxy939/AstraShield `data/cache/celestrak_active.tle`, ColaBear101/SattrackSlop `data/catalogue.txt`, Sky-OuO/Pc_TCN `data/collected_tle_datas_2026*.json`, kris70lesgo/helix `coral/data/helix_core/satellites.jsonl`
+4. Current element sets only (Nov 7-8 2026, outside the window): n2yo.com satellite pages, orbitalradar.com/satellite/<id>, celestrak gp.php?CATNR=68762, tle.ivanstanojevic.me, db.satnogs.org API.
+
+## Failed / not useful
+- web.archive.org: every connection reset through the agent proxy (CDX and snapshots). archive.org/wayback/available reported no snapshots of celestrak gp.php?CATNR=59103/68762 for Oct 2026.
+- CelesTrak: serves current data only. Connections were reset some of the time (gp.php?CATNR=59103, last-30-days, supplemental).
+- SatNOGS DB `/api/tle/?norad_cat_id=`: latest TLE only, no history. For 68762 it returned an empty list.
+- KeepTrack: /satellite/<id> pages are behind a Cloudflare challenge (403). The v4 API needs a key (401), and its OpenAPI has no per-object history endpoint. The v2 API was shut down (410).
+- tle.ivanstanojevic.me, n2yo, orbitalradar: latest set only.
+- Marco Langbroek blog (sattrackcam.blogspot.com), keeptrack.space deep-dive, integrityisr.com, diplomacyandlaw.com: analysis only, no TLE text.
+- zendir-dev/space-range-scripts and DigitalArsenal/space-data-network-modules: derived or illustrative data only (May 2026), or a local archive that is not in the repo.
@@ -0,0 +1,82 @@
+#!/usr/bin/env python3
+"""Compare the reconstruction with the public element-set history (tle/*.tle)."""
+import json, math, sys
+from datetime import datetime, timedelta, timezone
+import numpy as np
+from sgp4.api import Satrec, jday
+
+HERE = __file__.rsplit('/', 1)[0]
+MU = 398600.4418
+
+
+def load(path):
+    L = [l.rstrip('\n') for l in open(path) if l.strip()]
+    out = []
+    for i in range(len(L)):
+        if L[i].startswith('1 ') and i + 1 < len(L) and L[i + 1].startswith('2 '):
+            s = Satrec.twoline2rv(L[i], L[i + 1])
+            ep = datetime(2000, 1, 1, tzinfo=timezone.utc) + timedelta(days=s.jdsatepoch + s.jdsatepochF - 2451545.0 + 0.5)
+            out.append((ep, s, L[i], L[i + 1]))
+    out.sort(key=lambda x: x[0])
+    return out
+
+
+def st(s, d):
+    jd, fr = jday(d.year, d.month, d.day, d.hour, d.minute, d.second + d.microsecond / 1e6)
+    e, r, v = s.sgp4(jd, fr)
+    return np.array(r), np.array(v)
+
+
+def rel_rtn(rx, vx, rc):
+    R = rx / np.linalg.norm(rx)
+    N = np.cross(rx, vx); N /= np.linalg.norm(N)
+    T = np.cross(N, R)
+    th = math.atan2(np.dot(np.cross(rx, rc), N), np.dot(rx, rc))
+    return np.array([np.linalg.norm(rc) - np.linalg.norm(rx), th * np.linalg.norm(rx), np.dot(rc, N)]) * 1000
+
+
+def sma(s):
+    n = s.no_kozai / 60
+    return (MU / n ** 2) ** (1 / 3)
+
+
+X = load(f'{HERE}/tle/59103.tle')
+C = load(f'{HERE}/tle/68762.tle')
+D = json.load(open(f'{HERE}/data.json'))
+T0 = datetime.fromisoformat(D['t0'].replace('Z', '+00:00'))
+rel = np.array(D['rel']).reshape(-1, 3)
+
+
+def model_rel(d):
+    i = (d - T0).total_seconds() / D['dt']
+    if i < 0 or i >= len(rel) - 1:
+        return None
+    k = int(i)
+    return rel[k] + (rel[k + 1] - rel[k]) * (i - k)
+
+
+def nearest_x(d):
+    return min(X, key=lambda x: abs((x[0] - d).total_seconds()))
+
+
+rows = []
+for ep, s, l1, l2 in C:
+    if ep < datetime(2026, 9, 25, tzinfo=timezone.utc) or ep > datetime(2026, 10, 26, tzinfo=timezone.utc):
+        continue
+    xe, xs, _, _ = nearest_x(ep)
+    rx, vx = st(xs, ep)
+    rc, vc = st(s, ep)
+    r = rel_rtn(rx, vx, rc)
+    m = model_rel(ep)
+    dA = sma(s) - sma(xs)
+    di = math.degrees(s.inclo - xs.inclo)
+    dO = math.degrees(s.nodeo - xs.nodeo)
+    ec = (s.ecco * math.cos(s.argpo), s.ecco * math.sin(s.argpo))
+    ex = (xs.ecco * math.cos(xs.argpo), xs.ecco * math.sin(xs.argpo))
+    rows.append(dict(ep=ep.isoformat()[:16], xage_h=round((ep - xe).total_seconds() / 3600, 1), R=r[0], T=r[1], N=r[2], dA_km=dA, di=di, dO=dO,
+                     dex=(ec[0] - ex[0]) * sma(xs) * 1000, dey=(ec[1] - ex[1]) * sma(xs) * 1000,
+                     mT=None if m is None else m[1], mR=None if m is None else m[0]))
+print(f"{'epoch':17} {'xAge':>5} {'TLE T km':>10} {'model T':>10} {'TLE R km':>9} {'mod R':>7} {'N km':>7} {'dA km':>8} {'di deg':>7} {'dRAAN':>7} {'|de| m':>7}")
+for r in rows:
+    print(f"{r['ep']:17} {r['xage_h']:5} {r['T']/1000:10.2f} {('' if r['mT'] is None else f'{r[chr(109)+chr(84)]/1000:10.2f}'):>10} {r['R']/1000:9.2f} {('' if r['mR'] is None else f'{r[chr(109)+chr(82)]/1000:7.2f}'):>7} {r['N']/1000:7.2f} {r['dA_km']:8.3f} {r['di']:7.3f} {r['dO']:7.3f} {math.hypot(r['dex'], r['dey']):7.0f}")
+json.dump(rows, open(f'{HERE}/tle_rows.json', 'w'), default=str, indent=0)
@@ -0,0 +1,506 @@
+[
+{
+"ep": "2026-09-25T16:48",
+"xage_h": 3.5,
+"R": 8301.670539523002,
+"T": -8431513.722806757,
+"N": -27791.39877508352,
+"dA_km": 0.8983573483865257,
+"di": 0.018299999999994283,
+"dO": 0.3773000000000063,
+"dex": -697.9292820779607,
+"dey": 9783.360065963709,
+"mT": null,
+"mR": null
+},
+{
+"ep": "2026-09-26T16:42",
+"xage_h": 3.5,
+"R": 7570.832860136761,
+"T": -8559145.016498953,
+"N": -27973.72346945707,
+"dA_km": 0.9106827027590043,
+"di": 0.017800000000001946,
+"dO": 0.3791999999999937,
+"dex": -153.69173268221,
+"dey": 9872.028733885176,
+"mT": null,
+"mR": null
+},
+{
+"ep": "2026-09-27T18:12",
+"xage_h": 11.5,
+"R": 6815.196592958273,
+"T": -8698111.802384106,
+"N": -28185.292493290643,
+"dA_km": 0.9188939955174646,
+"di": 0.01769999999998821,
+"dO": 0.7201000000000007,
+"dex": 404.0796528142847,
+"dey": 9785.414288801614,
+"mT": null,
+"mR": null
+},
+{
+"ep": "2026-09-28T14:54",
+"xage_h": 0.3,
+"R": 6251.370799312099,
+"T": -8811622.590756347,
+"N": -28360.676199371275,
+"dA_km": 0.9310836171125629,
+"di": 0.017600000000012644,
+"dO": 0.24769999999999298,
+"dex": 1035.6495628865,
+"dey": 9792.560732639002,
+"mT": null,
+"mR": null
+},
+{
+"ep": "2026-09-30T16:22",
+"xage_h": 2.0,
+"R": 59781.09715962455,
+"T": -11167760.90800771,
+"N": -27690.064016225777,
+"dA_km": 47.460623747911995,
+"di": 0.017099999999994866,
+"dO": 0.31519999999999515,
+"dex": -6664.747931481048,
+"dey": -4354.727977192556,
+"mT": 75639512.43065125,
+"mR": 47012.709780189165
+},
+{
+"ep": "2026-10-01T14:54",
+"xage_h": 0.6,
+"R": 53198.61601430057,
+"T": -17454723.663578935,
+"N": -24621.218235828022,
+"dA_km": 47.475209599662776,
+"di": 0.017200000000008597,
+"dO": 0.2364000000000059,
+"dex": -6864.688025004593,
+"dey": -3957.3136394122175,
+"mT": 69369559.69491303,
+"mR": 46997.502157282
+},
+{
+"ep": "2026-10-02T15:02",
+"xage_h": -5.5,
+"R": 47456.624127597934,
+"T": 19341422.85974959,
+"N": -22997.83211902794,
+"dA_km": 47.488684068408475,
+"di": 0.017200000000008597,
+"dO": -0.04620000000000298,
+"dex": -7044.010744269706,
+"dey": -3504.5754305638343,
+"mT": 62651790.55734729,
+"mR": 46983.64728609734
+},
+{
+"ep": "2026-10-03T15:11",
+"xage_h": 1.1,
+"R": 49113.90241477966,
+"T": 12623642.1421986,
+"N": -20230.508617234882,
+"dA_km": 47.494710533775105,
+"di": 0.01730000000000961,
+"dO": 0.21320000000000022,
+"dex": -7289.578703191674,
+"dey": -3123.0249822608152,
+"mT": 55934040.62735785,
+"mR": 46984.004027369
+},
+{
+"ep": "2026-10-04T15:19",
+"xage_h": 1.4,
+"R": 51956.892104823964,
+"T": 5903878.433825442,
+"N": -16608.864333671896,
+"dA_km": 47.504150727611886,
+"di": 0.017400000000010622,
+"dO": 0.201599999999991,
+"dex": -7468.8080473937525,
+"dey": -2684.489511437165,
+"mT": 49216279.297819875,
+"mR": 46998.27676768883
+},
+{
+"ep": "2026-10-05T17:04",
+"xage_h": 1.6,
+"R": 56127.7648462119,
+"T": -1272584.9636815456,
+"N": -14658.070253380942,
+"dA_km": 47.517611120165384,
+"di": 0.017799999999989224,
+"dO": 0.18929999999999383,
+"dex": -7595.534591930674,
+"dey": -2300.7489457738766,
+"mT": 42050639.05895918,
+"mR": 47014.7910767715
+},
+{
+"ep": "2026-10-06T17:12",
+"xage_h": 3.5,
+"R": 61162.61451995888,
+"T": -8001362.706066734,
+"N": -12259.211912978088,
+"dA_km": 47.527051009651586,
+"di": 0.01810000000000498,
+"dO": 0.24560000000000357,
+"dex": -7732.876100480503,
+"dey": -1828.4307699860303,
+"mT": 35332833.7000085,
+"mR": 47017.20328388
+},
+{
+"ep": "2026-10-07T18:57",
+"xage_h": 5.3,
+"R": 58306.33261745879,
+"T": -15185307.898810113,
+"N": -8576.099649933036,
+"dA_km": 47.53267538061027,
+"di": 0.04850000000000716,
+"dO": 0.3031,
+"dex": -7856.039095884964,
+"dey": -1326.2684424572599,
+"mT": 28167197.222816538,
+"mR": 47003.41404208034
+},
+{
+"ep": "2026-10-08T15:52",
+"xage_h": 2.4,
+"R": 52514.75479914916,
+"T": -21033724.175330356,
+"N": -7142.919170412297,
+"dA_km": 47.54487423568935,
+"di": 0.048499999999994436,
+"dO": 0.16079999999999814,
+"dex": -7875.484256176535,
+"dey": -875.4380866070594,
+"mT": 22345153.534087613,
+"mR": 46988.85800007833
+},
+{
+"ep": "2026-10-08T22:18",
+"xage_h": 2.4,
+"R": 51497.189675082154,
+"T": 20689322.520410504,
+"N": -6897.771094663387,
+"dA_km": 47.54761663741556,
+"di": 0.048400000000006146,
+"dO": 0.15880000000000336,
+"dex": -7888.8449969662925,
+"dey": -736.3583175980484,
+"mT": 20553761.926370453,
+"mR": 46985.514538949996
+},
+{
+"ep": "2026-10-09T17:37",
+"xage_h": 13.8,
+"R": 51446.268358212365,
+"T": 15308183.123688515,
+"N": -5564.4826493221235,
+"dA_km": 47.54331188363631,
+"di": 0.048499999999994436,
+"dO": 0.6269000000000058,
+"dex": -8016.165683777107,
+"dey": -402.45493298203405,
+"mT": 15179597.556924822,
+"mR": 46981.85561155733
+},
+{
+"ep": "2026-10-10T17:45",
+"xage_h": 2.9,
+"R": 53263.35654009927,
+"T": 8580389.659196287,
+"N": -2318.666088893505,
+"dA_km": 47.56909692627778,
+"di": 0.04820000000000413,
+"dO": 0.14469999999998795,
+"dex": -7921.534256572002,
+"dey": 143.57808612758384,
+"mT": 8461897.028362235,
+"mR": 46991.616345465336
+},
+{
+"ep": "2026-10-11T17:53",
+"xage_h": 3.1,
+"R": 54550.0623332573,
+"T": 1846837.5125594211,
+"N": -193.04127280518975,
+"dA_km": 47.595951177626375,
+"di": 0.048000000000002103,
+"dO": 0.13699999999999912,
+"dex": -7899.280713350153,
+"dey": 649.4787396541252,
+"mT": 1744195.6615911566,
+"mR": 47008.70145931934
+},
+{
+"ep": "2026-10-11T22:43",
+"xage_h": 7.9,
+"R": 55217.78072005691,
+"T": 498276.48568582215,
+"N": 14.719970954402454,
+"dA_km": 47.596673418797764,
+"di": 0.04810000000000311,
+"dO": 0.3386999999999784,
+"dex": -7938.713847787283,
+"dey": 727.9745830575645,
+"mT": 400648.5541642541,
+"mR": 47011.6456086155
+},
+{
+"ep": "2026-10-13T14:34",
+"xage_h": 0.0,
+"R": -379.3799917648357,
+"T": -465249.99398902856,
+"N": 155.68420920650658,
+"dA_km": -0.20016123426285048,
+"di": -0.0007999999999953703,
+"dO": -0.001300000000000428,
+"dex": 476.58445577466443,
+"dey": 146.51391943944606,
+"mT": -441405.656846914,
+"mR": -137.67734491649946
+},
+{
+"ep": "2026-10-14T16:03",
+"xage_h": 9.6,
+"R": -370.6623293664961,
+"T": -435616.048035603,
+"N": 161.9253376635085,
+"dA_km": -0.20148191778662294,
+"di": -0.0007000000000070809,
+"dO": 0.40530000000000327,
+"dex": 382.3378309829219,
+"dey": 124.29206463422811,
+"mT": -411226.797806984,
+"mR": -137.69767118799967
+},
+{
+"ep": "2026-10-15T17:32",
+"xage_h": 1.6,
+"R": -2503.896276883097,
+"T": -192460.3169489883,
+"N": -301.68892792708317,
+"dA_km": -2.392243099448933,
+"di": -0.0002000000000020231,
+"dO": 0.07029999999999868,
+"dex": 225.28681157558015,
+"dey": -2185.570947233477,
+"mT": -186092.5266262922,
+"mR": -2435.684305768334
+},
+{
+"ep": "2026-10-15T23:54",
+"xage_h": 1.6,
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