🚀 Celestial Body Range Efficiency — 2D Lander Hop Range and Delta-v

2D companion of the celestial body range efficiency sim: a single-burn hop on an airless world integrated with RK4 gravity, delta-v from the rocket equation, range versus delta-v on seven bodies, and a check against the exact Kepler range formula.

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