Core told time eight ways: Date.now() in most layers, JulianDate.now() for
flights and military, Cesium's clock frozen at page load for the sky, the
weather clock for observed imagery. They now read one clock,
src/time/worldClock.js, exported as ./time.
Live is a mode, not a timestamp: while live the clock is the wall clock,
so every layer draws as before. Away from live only the layers that follow
the clock move with it. The weather products follow it, as they followed
the weather transport; a host opts others in with follow(id).
- The weather clock takes its time from the world clock and drives its
replay, stepping its frames as before.
- Satellites, launches, flights and military (still 30 s and 15 s behind),
transit, GNSS, Recent Imagery, street level, the HUD and the celestial
ring read worldTimeFor(id). Cadences stay on the wall clock.
- Cesium's sky (stars, sun, moon, atmosphere, lighting) draws at the world
time each frame instead of the moment the page loaded.
- Weather frames and satellites declare coverage() for a host's timeline.
Catalog numbers above 99999 arrive in a TLE as Alpha-5: a letter A-Z,
skipping I and O, stands for 10-33 in the ten-thousands place, so 100000
is A0000. satellite.js keeps the field as the string satrec.satnum, and
the three catalog builders converted it with Number(), which gives NaN;
the Set and Map used to deduplicate and store treat NaN as equal to NaN,
so the first such satellite was stored under NaN and every later one was
dropped as a duplicate (#751). The satellite tools read the same field
with parseInt and reported no number, so such a satellite could not be
found by it.
The decoder lives in src/sources/tle.js, beside parseTleText, which the
layer and the tools both import already: noradIdFromSatnum() for the
three builders, and tleCatalogNumber() decodes through the same function.
Every other field reads as it did before: Number() in the layer,
parseInt or null in the tools.
Sameh Khamis