Orbit & Ground-Track Visualizer

Try this in class

1. Start at e = 0. Speed is constant and the track is a clean sinusoid.
2. Raise e to about 0.2 — the ellipse appears and the speed readout starts to breathe.
3. Push e to 0.6 or more. The satellite whips through perigee and crawls near apogee.
4. Change inclination — the track's latitude limits follow it (±i, or ±180°−i above 90°).
5. Let it run for several revolutions: each pass shifts west because the Earth turned underneath.
6. Load Molniya-like and watch the long northern dwell that a circular orbit cannot give.