metonic-cycle

Metonic cycle

[mi-ton-ik]
noun Astronomy.
a cycle of 235 synodic months, very nearly equal to 19 years, after which the new moon occurs on the same day of the year as at the beginning of the cycle with perhaps a shift of one day, depending on the number of leap years in the cycle.

Origin:
1880–85; named after Meton, 5th-century b.c. Athenian astronomer; see -ic

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Metonic cycle (mɪˈtɒnɪk)
 
n
See also golden number a cycle of nearly 235 synodic months after which the phases of the moon recur on the same days of the year
 
[C17: named after Meton, 5th-century bc Athenian astronomer]

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