Kepler's Time Law

Kepler's Time Law states that a planet’s orbital period—the time it takes to complete one full orbit around the Sun—is related to its average distance from the Sun. Specifically, the farther a planet is from the Sun, the longer it takes to orbit. Mathematically, the square of the orbital period is proportional to the cube of the average distance. This means that planets closer to the Sun, like Mercury, orbit faster than planets farther away, like Neptune. The law helps us understand the precise relationship between a planet's orbit size and the time it takes to complete that orbit.