In orbital mechanics, mean motion (representit bi n) is the angular speed required for a bouk tae complete ane orbit, assumin constant speed in a circular orbit which completes in the same time as the variable speed, elliptical orbit o the actual bouk.[1]


  1. Seidelmann, P. Kenneth; Urban, Sean E., eds. (2013). Explanatory Supplement to the Astronomical Almanac (3rd ed.). University Science Books, Mill Valley, CA. p. 648. ISBN 978-1-891389-85-6.