🧪 Planetary Orbits Simulator — Gravitational Dynamics, Kepler's Laws, and Orbital Drag

This simulation lets you model planetary orbits under Newtonian gravity, adjusting semi-major axis, eccentricity, and inclination to see how Kepler's laws shape elliptical paths. A new Orbital Drag control adds an atmospheric- or solar-wind-style deceleration that opposes the planet's velocity, letting you watch a stable orbit slowly decay instead of persisting forever.

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