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About: Mean motion     Goto   Sponge   NotDistinct   Permalink

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Type: Thingyago:WikicatOrbitsyago:Line108593262yago:Location100027167yago:Object100002684yago:Orbit108612049yago:Path108616311yago:PhysicalEntity100001930yago:YagoGeoEntityyago:YagoLegalActorGeoyago:YagoPermanentlyLocatedEntity New Facet based on Instances of this Class

In orbital mechanics, mean motion (represented by n) is the angular speed required for a body to complete one orbit, assuming constant speed in a circular orbit which completes in the same time as the variable speed, elliptical orbit of the actual body. The concept applies equally well to a small body revolving about a large, massive primary body or to two relatively same-sized bodies revolving about a common center of mass. While nominally a mean, and theoretically so in the case of two-body motion, in practice the mean motion is not typically an average over time for the orbits of real bodies, which only approximate the two-body assumption. It is rather the instantaneous value which satisfies the above conditions as calculated from the current gravitational and geometric circumstances of