A brass mechanical model of the solar system: planets orbit at correct relative periods, driven by a visible meshing gear train below. Each planet's base gear has a tooth count sized to its real orbital period, so a single driving motion turns every gear at a different rate, the way a real clockwork orrery reproduces the planets' true relative speeds from fixed gear ratios rather than by timing each arm separately. Larger, slower outer planets like Saturn sit on gears with more teeth turning far more slowly than Mercury's small, fast-spinning gear, mirroring how far-out planets take dramatically longer to complete an orbit. Drag to orbit, scroll to zoom.