Three-Body Motion

Three bodies. A changing canvas of gravity. Three-Body Motion turns the three-body problem into an interactive orbit experience. Watch paths unfold, adjust the speed, pause or replay, and rotate the view with a two-finger drag. Live coordinates, initial conditions, and orbit notes help you explore what you see. Three classic orbits, free to explore • Figure Eight • Butterfly I • Bumblebee All three include playback controls, view controls, live information, language settings, and an introduction to the three-body problem. Pro: one purchase, permanent access, no subscription • All 16 classic orbits, including 13 additional Pro orbits • A catalog of 10,059 published numerical 3D periodic solutions, with selection by number or at random • Random three-body motion • Custom initial conditions: change each body's mass, starting position, and velocity to explore new trajectories Purchase and restore purchases through the App Store. Explore anywhere Orbit data, simulation, explanations, and all ten languages are bundled with the app. Core features work offline. Purchases and purchase restoration require an App Store connection; external reference links require internet access. Available on iPhone and iPad in Simplified Chinese, Traditional Chinese, English, Japanese, Korean, Spanish, Portuguese, French, Italian, and German. The app generates trajectories through numerical simulation using published initial conditions for its classic and 3D catalogs. Orbit notes and return-error information accompany the simulation. Changing initial conditions creates a new trajectory, giving you a visual way to explore gravity, periodic motion, and chaos.