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Metonic cycle

A Dictionary of Astronomy | 1997 | Copyright

Metonic cycle A period of 19 years after which the Moon's phases repeat on approximately the same calendar dates. The cycle was discovered by the ancient Greek astronomer Meton in the 5th century bc and is used in constructing lunisolar calendars. It occurs because there are almost exactly 235 synodic months (lunations) in 19 tropical years.

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Metonic cycle

The Oxford Dictionary of Phrase and Fable | 2006 | | Copyright

Metonic cycle a period of 19 years (235 lunar months), after which the new and full moons return to the same day of the year. It was the basis of the ancient Greek calendar, and is still used for calculating movable feasts such as Easter. It is named after Metōn, an Athenian astronomer of the 5th century bc.

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ELIZABETH KNOWLES. "Metonic cycle." The Oxford Dictionary of Phrase and Fable. 2006. Encyclopedia.com. 1 Jun. 2012 <http://www.encyclopedia.com>.

ELIZABETH KNOWLES. "Metonic cycle." The Oxford Dictionary of Phrase and Fable. 2006. Encyclopedia.com. (June 1, 2012). http://www.encyclopedia.com/doc/1O214-Metoniccycle.html

ELIZABETH KNOWLES. "Metonic cycle." The Oxford Dictionary of Phrase and Fable. 2006. Retrieved June 01, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O214-Metoniccycle.html

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Metonic cycle

The Columbia Encyclopedia, 6th ed. | 2011 | Copyright

Metonic cycle see synodic period .

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