Metonic cycle

Me·​ton·​ic cycle | \ meˈtänik-\

Definition of Metonic cycle

: a period of 19 years after the lapse of which the phases of the moon return to a particular date in the calendar year:
a : one of the 19-year periods reckoning from June 27, 432 b.c., that were used in determining lengths of years and the placing of the intercalary month in the ancient Greek calendar
b : one of the 19-year periods reckoning from 1 b.c. that are used in determining the date of Easter in the Gregorian calendar

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History and Etymology for Metonic cycle

Meton, 5th century b.c. Greek astronomer + English -ic

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characterized by aphorism

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