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precession of the equinoxes
pre·ces·sion of the e·qui·nox·es


noun 
Definition:
 
westward movement of equinoxes: the slow westward movement of the equinoxes, resulting from the Earth's precessional motion, making them occur slightly earlier each year
Encarta® World English Dictionary [North American Edition] © & (P)2009 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc.
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