Home▸Space & Astronomy▸Planetary Retrograde Loops (2D): Kepler Orbits, Synodic Periods and the Sky Track of a Planet Seen from Earth

🪐 Planetary Retrograde Loops (2D): Kepler Orbits, Synodic Periods and the Sky Track of a Planet Seen from Earth

2D companion of the planetary retrograde loops sim: Kepler orbits of Earth and a chosen planet, the geocentric sky track with retrograde loops, synodic periods and stationary points, with numeric checks of the Kepler solver, the synodic period and the stationary angle.

Space & Astronomy2DModerate60 FPS📱 Mobile-adapted⇄ 3D version

⚙ Under the hood

The 2D companion of the planetary retrograde loops lab: Kepler orbits of Earth and a chosen planet next to the geocentric sky track with retrograde loops, synodic period and stationary points, with checks of the Kepler solver, the synodic period and the analytic stationary angle.

Retrograde MotionSynodic PeriodKepler's LawsSky TrackPlanetary Orbits

2D · HTML5 Canvas 2D · 60 FPS target · runs fully client-side, no install