Kepler's third law relates the square of the planet's orbital period in years to the cube of its average distance from the Sun in astronomical units.

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Kepler's third law, also known as the Law of Harmonies, states that the square of the orbital period of a planet is directly proportional to the cube of the semi-major axis of its orbit. This means that if you know the average distance of a planet from the Sun in astronomical units (AU), you can calculate its orbital period in years, and vice versa, by applying this law.

Kepler's Third Law Relates the Square of the Planet's Orbital