Online Encyclopedia

METONIC CYCLE

Online Encyclopedia
Originally appearing in Volume V18, Page 299 of the 1911 Encyclopedia Britannica.
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METONIC

CYCLE  , in chronology, a period of 19 years during which there are 235 lunations, so called because discovered by Meton . Computation from
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modern data shows that 235 lunations are 6939 days, 16.5 hours; and 19 solar years, 6939 days, 14.5 hours . The relation between integral numbers of months and years expressed by Meton's
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rule therefore deviates only two hours from the truth . Since 19 Julian years make 6939 days, 18 hours, the relation errs by only 1.5
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hour when the Julian
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year is taken . Meton was an Athenian astronomer (fl . 432 B.C.) .

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