Home▸Space & Astronomy▸Brass Orrery: Gear Ratios vs Kepler's True Sky

🪐 Brass Orrery: Gear Ratios vs Kepler's True Sky

A crank-driven brass orrery whose planets are turned by real tooth-count gear trains. Compare the brass circles with Kepler's true ellipses, watch the gear-ratio drift and equation-of-centre error build up, and see equal areas swept in equal times.

Space & Astronomy3DModerate60 FPS📱 Mobile-adapted🟠 Blender

⚙ Under the hood

Turn the crank of a brass orrery whose planets are driven by real tooth-count gear trains, then compare the uniform brass circles with Kepler's true ellipses: gear-ratio drift, equation-of-centre error and equal areas swept in equal times.

OrreryKepler's LawsGear RatiosCelestial MechanicsThree.jsBlender

3D · Three.js / WebGL renderer · 60 FPS target · runs fully client-side, no install