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Metonic

   Also found in: Encyclopedia, Wikipedia 0.01 sec.
Me`ton´ic
a.1.Pertaining to, or discovered by, Meton, the Athenian.
Metonic year
(Astron.) See under Cycle.
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This points to the Metonic cycle, the well-known period of 19 years after which the lunar phases repeat on (nearly) the same dates of the year.
Interesting patterns from umbral lunar eclipses by Beard, Darren; Meeus, Jean / Journal of the British Astronomical Association
They figured it was able to estimate a 365-day calendar with the leap day ingeniously included; the 19-year Metonic calendar devised by the Babylonians; and a predictor of eclipses over a 223-month cycle, including a complex motion that became notorious as the "First Anomaly" of the Moon.
Ancient world's "supercomputer" calculated Olympic Games by AFP / AFP Global Edition
Another may be to question why the Mishnaic calendar was observationally based, while the Babylonian calendar it supposedly derived from had already evolved into a calculated calendar based on the 19-year Metonic cycle since the fifth century B.
A History of Jewish Time by Feldman, Ron H. / Judaism: A Quarterly Journal of Jewish Life and Thought
 
 
 
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