Orbital period

In astronomy, the orbital period is the time it takes for an astronomical object to complete one cycle of revolution around another body. The orbital period of a star or planet is the time it takes to return to the same place in the orbit. The spin period of a star is the time it takes to rotate on its axis.

Alternately, a wave period is the time taken for one complete cycle of the wave to pass a reference point.


 * The period, P of an orbit, rotation, or wave, is just the inverse of the frequency, f


 * The orbital period, P of two bodies of mass M and m that are gravitationally bound and separated by a distance R

G is Newton’s gravitational constant.