diff --git a/CHANGELOG.md b/CHANGELOG.md
index 0d6c42632..335a5b9b2 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -38,6 +38,10 @@
 
 - Director assets cancelled during the final stream read are discarded with reader cleanup.
 
+- Analyst queries preserve useful rows when an upstream timestamp is outside the supported date range.
+
+- Fire detections with missing or impossible positions are skipped while genuine zero coordinates remain valid.
+
 - Frequently reused terrain batches retain their cached heights ahead of unused cells.
 
 - Recent Imagery’s exported `setBox` and `searchHls` reject missing, blank or
diff --git a/docs/CURRENT-STATE.md b/docs/CURRENT-STATE.md
index de4ca26ca..323bb104e 100644
--- a/docs/CURRENT-STATE.md
+++ b/docs/CURRENT-STATE.md
@@ -75,6 +75,8 @@ Windows/Claude Desktop Cowork confirmation remains outstanding (#927).
 
 Tool argument string lengths follow JSON Schema Unicode code-point counts, so supplementary characters count once rather than as two UTF-16 units.
 
+Query timestamps outside the representable Date range are reported as null, preserving the rest of the result row.
+
 `gods-eye-view/tools` defines queries that answer questions from the app's data,
 and `gods-eye-view/tools/mcp` exposes a composed catalog over the Model Context
 Protocol. `npm run mcp` serves Core's tools over stdio to a local MCP client,
@@ -1433,6 +1435,8 @@ accessible name remains "Don't show this again". Control behavior is unchanged.
 
 ## FIRMS source status
 
+FIRMS ingestion and adaptation require explicit finite coordinates within WGS84 ranges; genuine zero coordinates remain valid and admitted detection indices stay sequential.
+
 The FIRMS proxy records source success after appending its rows. If aggregation
 throws, that source reports failure without a contradictory success entry.
 The existing per-record append continues to support large feeds; sequential
diff --git a/src/data/firms-coordinate-evidence.test.mjs b/src/data/firms-coordinate-evidence.test.mjs
new file mode 100644
index 000000000..d60a7ee37
--- /dev/null
+++ b/src/data/firms-coordinate-evidence.test.mjs
@@ -0,0 +1,69 @@
+import test from 'node:test';
+import assert from 'node:assert/strict';
+import { parseFirmsCsv } from './firmsCsv.js';
+import { adaptFirmsRecords } from './firmsAdapt.js';
+test('missing positions do not become fire detections at zero coordinates', () => {
+  const csv =
+    'latitude,longitude,acq_date,acq_time,confidence,frp\n,1,2026-07-16,1200,n,1\n1, ,2026-07-16,1200,n,1\n95,1,2026-07-16,1200,n,1\n1,181,2026-07-16,1200,n,1\n0,0,2026-07-16,1200,n,1\n-90,-180,2026-07-16,1200,n,1';
+  assert.deepEqual(
+    parseFirmsCsv(csv).map((r) => [r.lat, r.lon]),
+    [
+      [0, 0],
+      [-90, -180],
+    ],
+  );
+  const records = [
+    { lat: null, lon: 1 },
+    { lat: '', lon: 1 },
+    { lat: false, lon: 1 },
+    { lat: 95, lon: 1 },
+    { lat: 1, lon: 181 },
+    { lat: '0', lon: 0 },
+    { lat: -90, lon: -180 },
+  ];
+  assert.deepEqual(
+    adaptFirmsRecords(records).map((r) => [r.index, r.lat, r.lon]),
+    [
+      [0, 0, 0],
+      [1, -90, -180],
+    ],
+  );
+});
+
+test('both axes keep their exact bounds and drop values just past them', () => {
+  const row = (lat, lon) => `${lat},${lon},2026-07-16,1200,n,1`;
+  const csv = [
+    'latitude,longitude,acq_date,acq_time,confidence,frp',
+    row(90, 180),
+    row(-90, -180),
+    row(90.000001, 0),
+    row(-90.000001, 0),
+    row(0, 180.000001),
+    row(0, -180.000001),
+    row(' ', 5),
+    row(5, '\t'),
+  ].join('\n');
+  assert.deepEqual(
+    parseFirmsCsv(csv).map((r) => [r.lat, r.lon]),
+    [
+      [90, 180],
+      [-90, -180],
+    ],
+  );
+  const kept = adaptFirmsRecords([
+    { lat: 90, lon: 180 },
+    { lat: '-90', lon: '-180' },
+    { lat: -90.000001, lon: 0 },
+    { lat: 0, lon: -180.000001 },
+    { lat: 5, lon: ' ' },
+    { lat: 5, lon: undefined },
+    { lat: [5], lon: 5 },
+  ]);
+  assert.deepEqual(
+    kept.map((r) => [r.lat, r.lon]),
+    [
+      [90, 180],
+      [-90, -180],
+    ],
+  );
+});
diff --git a/src/data/firmsAdapt.js b/src/data/firmsAdapt.js
index 2fc909bce..312838e80 100644
--- a/src/data/firmsAdapt.js
+++ b/src/data/firmsAdapt.js
@@ -7,8 +7,8 @@
  */
 
 /**
- * Map proxy fire records into internal fire records. Records with
- * non-finite coordinates are skipped; `index` is the post-skip position
+ * Map proxy fire records into internal fire records. Records with missing,
+ * non-numeric or out-of-range (WGS84) coordinates are skipped; `index` is the post-skip position
  * (it keys pick ids and context-store ids, so it must stay sequential).
  * `contextEntity`/`position` start null and are lazily filled by the layer.
  * @param {?Array<Object>} records - /api/firms `fires` array.
@@ -21,7 +21,15 @@ export function adaptFirmsRecords(records) {
   for (const record of records) {
     const lat = Number(record?.lat);
     const lon = Number(record?.lon);
-    if (!Number.isFinite(lat) || !Number.isFinite(lon)) continue;
+    if (
+      !hasCoordinateValue(record?.lat) ||
+      !hasCoordinateValue(record?.lon) ||
+      !Number.isFinite(lat) ||
+      !Number.isFinite(lon) ||
+      Math.abs(lat) > 90 ||
+      Math.abs(lon) > 180
+    )
+      continue;
     fires.push({
       index: fires.length,
       lat,
@@ -110,3 +118,11 @@ function finiteNumber(value) {
   const number = Number(value);
   return Number.isFinite(number) ? number : 0;
 }
+
+// Same rule as parseFirmsCsv: a blank or non-numeric value is not a zero.
+function hasCoordinateValue(value) {
+  return (
+    typeof value === 'number' ||
+    (typeof value === 'string' && value.trim() !== '')
+  );
+}
diff --git a/src/data/firmsCsv.js b/src/data/firmsCsv.js
index 7f9019e18..aafeac50b 100644
--- a/src/data/firmsCsv.js
+++ b/src/data/firmsCsv.js
@@ -105,7 +105,17 @@ export function parseFirmsCsv(text) {
     if (parts.length < header.length) continue; // malformed row — skip
     const lat = Number(parts[iLat]);
     const lon = Number(parts[iLon]);
-    if (!Number.isFinite(lat) || !Number.isFinite(lon)) continue;
+    // Blank or out-of-range positions are dropped, never read as 0 (see
+    // hasCoordinateValue in firmsAdapt.js for the proxy-record side).
+    if (
+      !parts[iLat].trim() ||
+      !parts[iLon].trim() ||
+      !Number.isFinite(lat) ||
+      !Number.isFinite(lon) ||
+      Math.abs(lat) > 90 ||
+      Math.abs(lon) > 180
+    )
+      continue;
 
     records.push({
       lat,
diff --git a/src/tools/results.js b/src/tools/results.js
index 51ed82bbb..f9af7af3d 100644
--- a/src/tools/results.js
+++ b/src/tools/results.js
@@ -24,7 +24,9 @@ export function capRows(rows, limit = DEFAULT_LIMIT) {
 
 /** Format an epoch millisecond time as ISO 8601, or null. */
 export function isoTime(ms) {
-  return Number.isFinite(ms) ? new Date(ms).toISOString() : null;
+  if (!Number.isFinite(ms)) return null;
+  const date = new Date(ms);
+  return Number.isFinite(date.getTime()) ? date.toISOString() : null;
 }
 
 /** "1 earthquake", "3 earthquakes". */
diff --git a/src/tools/tool-timestamp-range.test.mjs b/src/tools/tool-timestamp-range.test.mjs
new file mode 100644
index 000000000..7aeee737b
--- /dev/null
+++ b/src/tools/tool-timestamp-range.test.mjs
@@ -0,0 +1,59 @@
+import test from 'node:test';
+import assert from 'node:assert/strict';
+import { isoTime } from './results.js';
+import { getBikeShare } from './queries/mobility.js';
+test('out-of-range finite timestamps are unknown rather than throwing', async () => {
+  for (const value of [1e30, -1e30, NaN, Infinity, null])
+    assert.equal(isoTime(value), null);
+  assert.equal(isoTime(0), '1970-01-01T00:00:00.000Z');
+  assert.equal(isoTime(8640000000000000), '+275760-09-13T00:00:00.000Z');
+  assert.equal(isoTime(-8640000000000000), '-271821-04-20T00:00:00.000Z');
+  for (const value of [8640000000000001, -8640000000000001, -Infinity])
+    assert.equal(isoTime(value), null);
+  assert.equal(isoTime(-1), '1969-12-31T23:59:59.999Z');
+  const station = {
+    station_id: 's1',
+    name: 'Fixture',
+    lat: 0,
+    lon: 0,
+    capacity: 4,
+  };
+  const result = await getBikeShare.run(
+    { area: { bbox: [-1, -1, 1, 1] } },
+    {
+      services: {
+        bikeshare: {
+          systems: [
+            {
+              id: 'fixture',
+              city: 'Fixture',
+              centerLat: 0,
+              centerLon: 0,
+              loadRadiusKm: 30,
+              stationInformationUrl: 'information',
+              stationStatusUrl: 'status',
+            },
+          ],
+          async getStations(url) {
+            return {
+              data: {
+                stations:
+                  url === 'information'
+                    ? [station]
+                    : [
+                        {
+                          station_id: 's1',
+                          last_reported: 1e30,
+                          num_bikes_available: 2,
+                        },
+                      ],
+              },
+            };
+          },
+        },
+      },
+    },
+  );
+  assert.equal(result.data.returned, 1);
+  assert.equal(result.data.rows[0].last_reported, null);
+});
diff --git a/src/voice/gevActions.js b/src/voice/gevActions.js
index 9e1e183d0..267f633ff 100644
--- a/src/voice/gevActions.js
+++ b/src/voice/gevActions.js
@@ -4808,8 +4808,9 @@ function compactAnalystItem(r) {
   for (const [key, spec] of Object.entries(fields)) {
     if (!present(r[key]) || key in compact) continue;
     if (spec.type === 'time') {
-      const ms = Number(r[key]);
-      if (Number.isFinite(ms)) compact.time = new Date(ms).toISOString();
+      // A finite value can still be past Date's range, where toISOString throws.
+      const time = new Date(Number(r[key]));
+      if (Number.isFinite(time.getTime())) compact.time = time.toISOString();
     } else compact[key] = r[key];
   }
   if (present(r.ageHours)) compact.ageHours = r.ageHours;
diff --git a/src/voice/gevActions.test.mjs b/src/voice/gevActions.test.mjs
index 3d0e35b3e..2a80b829c 100644
--- a/src/voice/gevActions.test.mjs
+++ b/src/voice/gevActions.test.mjs
@@ -3459,6 +3459,26 @@ test('analyst_query refusals carry their code and the allowed values', async ()
   assert.match(ok.items[0].time, /^\d{4}-\d\d-\d\dT/);
 });
 
+test('analyst_query keeps its answer when one record has an out-of-range time', async () => {
+  globalThis.window = globalThis.window || { clearTimeout, setTimeout, requestIdleCallback: null };
+  const now = Date.now();
+  const earthquakes = {
+    getStats: () => ({ count: 2, lastUpdate: now }),
+    getAnalystRecords: () => [
+      { id: 'q', lat: 0, lon: 0, magnitude: 5, timeMs: now },
+      { id: 'r', lat: 1, lon: 1, magnitude: 4, timeMs: 8.64e15 + 1 },
+    ],
+  };
+  const { runner } = manifestRunner({ earthquakes }, { enabled: ['earthquakes'] });
+  const result = await runner('analyst_query', { layers: ['earthquakes'], scope: { kind: 'anywhere' } });
+  assert.equal(result.ok, true);
+  const q = result.items.find((item) => item.id === 'q');
+  assert.match(q.time, /^\d{4}-\d\d-\d\dT/);
+  const r = result.items.find((item) => item.id === 'r');
+  assert.ok(r, 'the record is still listed');
+  assert.equal(r.time, undefined, 'an unrepresentable time is omitted');
+});
+
 test('spoken layer names from the manifest reach the newer layers', async () => {
   globalThis.window = globalThis.window || { clearTimeout, setTimeout, requestIdleCallback: null };
   const stub = () => ({ getStats: () => ({ count: 0 }) });