Kepler's Third Law: Orbital Resonance Countdown (3D)

Two or three bodies orbit a central mass with radii and periods genuinely linked by Kepler's third law, T² ∝ r³. Set an integer period ratio and the bodies lock into a real orbital resonance — the same mechanism behind Pluto's 3:2 lock with Neptune and the 1:2:4 Laplace resonance of Jupiter's Galilean moons — with a live countdown to the next exact realignment of the starting configuration. Detune the ratio slider away from a simple fraction and the countdown vanishes: the bodies drift through every relative angle and the traced path never closes, the real observable difference between a resonant and a non-resonant orbit.