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planetary precessionSee precession.
Collins Dictionary of Astronomy © Market House Books Ltd, 2006
planetary precession[′plan·ə‚ter·ē pri′sesh·ən]
A comparatively small eastward motion of the equinoxes caused by the action of other planets in altering the plane of the earth's orbit.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.