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METONIC CYCLE

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Originally appearing in Volume V18, Page 299 of the 1911 Encyclopedia Britannica.
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METONIC See also:

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

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