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PolskiGyroscopic Orrery: Gear-Train Orbital Mechanics (2D)
Top-down clockwork orrery: a central gear meshes with a small gear at every arm's pivot, and the real gear-mesh ratio between them sets each planet's orbital period — one speed knob drives the whole train.
This 2D companion shows the same clockwork idea from above: a central brass gear meshes with a small gear fixed at each arm's pivot, and because meshing gears share the same pitch-line speed, a gear's radius directly sets its spin rate relative to the central gear. Each arm's real-world orbital period is derived from that same ratio, so dragging the single "central gear speed" slider speeds up every planet together while preserving their relative periods — exactly how a real motor-free orrery works.
Top-down 2D orrery: a central drive gear meshes with each arm's own gear, and the gear-mesh ratio sets each planet's real orbital period from one speed control.
2D · HTML5 Canvas 2D · 60 FPS target · runs fully client-side, no install