Metoniccycle

Me·ton·ic cycle (mĭ-tŏnʹĭk) n.

A period of 235 lunar months, or about 19 years in the Julian calendar, at the end of which the phases of the moon recur in the same order and on the same days as in the preceding cycle.

  [After Meton (fl. fifth century B.C.), Athenian astronomer.]

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