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Metonic cycle definition

Me·tonic cycle (mə tän′ik)

a period of about 19 years (almost 235 lunar revolutions), in which the phases of the moon repeat on the same dates as in the previous period: used for finding the date of Easter

Etymology: after Meton, Athenian astronomer (5th c. )

Webster's New World College Dictionary Copyright © 2009 by Wiley Publishing, Inc., Cleveland, Ohio.
Used by arrangement with John Wiley & Sons, Inc.

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