Metonic cycle

The Metonic cycle in astronomy and calendar studies is an approximate common multiple[?] of the orbital periods of the Earth and the Moon. 19 tropical years differ from 235 synodic months by just about 2 hours.

This approximation is used by the Hebrew calendar. It was known to the Greek astronomer Meton[?], who introduced about 432 BC, and the Chaldean astronomer Kidinnu (4th cy. BC). It is also used in the calculation of the date for Easter.

		Metonic cycle
		The Metonic cycle in astronomy and calendar studies is an approximate common multiple[?] of the orbital periods of the Earth and the Moon. 19 tropical years differ from 235 synodic months by just about 2 hours. This approximation is used by the Hebrew calendar. It was known to the Greek astronomer Meton[?], who introduced about 432 BC, and the Chaldean astronomer Kidinnu (4th cy. BC). It is also used in the calculation of the date for Easter.
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