Metonic cycle

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Me·ton·ic cycle

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 bc), Athenian astronomer.]

Metonic cycle

(Astronomy) a cycle of nearly 235 synodic months after which the phases of the moon recur on the same days of the year. See also golden number
[C17: named after Meton, 5th-century bc Athenian astronomer]
References in periodicals archive ?
According to Loewinger, based on his study of the fixed Hebrew calendar, the 8th year in the 19-year Metonic cycle should not be intercalated, as it is unnecessary.
The short (3 dots, rarely only 2 dots, very rarely 4 dots) horizontal parts of the nearly horizontal lines refer to eclipses that are separated by one Metonic cycle.
This relation is that, to six places of decimals, the number of days in 19 tropical years is equal to the number of days in 235 lunar cycles and is known as the metonic cycle.
Another may be to question why the Mishnaic calendar was observationally based, while the Babylonian calendar it supposedly derived from had already evolved into a calculated calendar based on the 19-year Metonic cycle since the fifth century B.
6) Nineteen is not an arbitrary number; rather it may be a reference to the Metonic cycle or period, which is defined by OED as `the cycle of 19 Julian years .
This September 27th, one Metonic cycle later, a very similar total lunar eclipse will be widely seen during the evening throughout the Americas.
The 2005 annular eclipse in Madrid, Spain, was one Metonic cycle from the 1986 eclipse.