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Loading contentThe locking of a body's rotation to its orbit by tides. The Moon keeps one face toward the Earth in a 1:1 lock, while Mercury rotates three times for every two orbits of the Sun — a 3:2 spin–orbit resonance.
Facts on this topic will be cited from these primary and reference sources.
Orbital data, ephemerides, and small-body parameters for planets, asteroids, and comets.