🪐 Gravity Assist Flyby (2D top view and velocity triangle)

2D top view of a spacecraft passing a planet: choose Jupiter, Saturn or Earth, the arrival speed and the miss distance, and watch the path bend in the planet frame while the velocity triangle shows the speed gained or lost relative to the Sun. Same restricted three-body integrator as the 3D page, with four numerical checks.

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