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1. iss_schedule() was importing TLE_SATELLITES directly from data/satellites.py (hardcoded, 446 days stale) instead of the live _tle_cache kept fresh by the 24h auto-refresh. Add get_cached_tle() to satellite.py and use it. 2. Ground track was a fake sine wave (inclination * sin(phase)) that mapped longitude offset directly to orbital phase, ignoring Earth's rotation under the satellite (~23° westward shift per orbit). Replace with a /sstv/iss-track endpoint that propagates the orbit via skyfield SGP4 over ±90 minutes, and update the frontend to call it. Past/future track rendered with separate polylines (dim solid vs bright dashed). 3. refresh_tle_data() updated _tle_cache in memory but never persisted back to data/satellites.py, so every restart reloaded the stale hardcoded TLE. Add _persist_tle_cache() called after each successful refresh. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
