Mean motion is the average orbital angular frequency. A Kepler orbit about gravitational parameter has .
The synodic period is the interval between successive repetitions of the relative orbital configuration of two bodies. For coplanar prograde mean motions , it is .
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Mean motion, in the context of celestial mechanics, refers to the average angular speed at which an orbiting body travels around a primary body, typically expressed in degrees or radians per unit time. It provides a way to quantify how fast an object moves in its orbit, ignoring the gravitational influences that cause variations in speed due to the elliptical nature of most orbits.