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Metonic cycle

[mi-ton-ik] /mɪˈtɒn ɪk/
noun, Astronomy
1.
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
1880-1885
1880-85; named after Meton, 5th-century b.c. Athenian astronomer; see -ic
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for Metonic cycle

Metonic cycle

/mɪˈtɒnɪk/
noun
1.
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
Word Origin
C17: named after Meton, 5th-century bc Athenian astronomer
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Encyclopedia Article for Metonic cycle

in chronology, a period of 19 years in which there are 235 lunations, or synodic months, after which the Moon's phases recur on the same days of the solar year, or year of the seasons. The cycle was discovered by Meton (fl. 432 BC), an Athenian astronomer. Computation from modern data shows that 235 lunations are 6,939 days, 16.5 hours; and 19 solar years, 6,939 days, 14.5 hours. See also golden number.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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