libration

English Thesaurus

1. (astronomy) a real or apparent slow oscillation of a moon or satellite (noun.process)

hypernym	:	variation,
definition	:	(astronomy) any perturbation of the mean motion or orbit of a planet or satellite (especially a perturbation of the earth's moon) (noun.phenomenon)

hypernym	:	oscillation,
definition	:	the process of oscillating between states (noun.process)

domain category	:	astronomy, uranology,
definition	:	the branch of physics that studies celestial bodies and the universe as a whole (noun.cognition)

derivation	:	librate,
definition	:	vibrate before coming to a total rest (verb.motion)

derivation	:	librate,
definition	:	vibrate before coming to a total rest (verb.motion)