## orbital periodThe time taken for a body to go once around a closed orbit. The orbital period of a planet is its "year". For a body in an elliptical orbit of semimajor axis a about a much more massive body of mass M the orbital
period P is given by P = (2πa^{3/2}) / √(gM).
This is the mathematical formulation of the third of Kepler's laws of planetary motion. ## Related category• CELESTIAL MECHANICS | |||||

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