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synodic period
(redirected from Metonic cycle)

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synodic period

Time taken for a planet or moon to return to the same position in its orbit as seen from the Earth; that is, from one opposition to the next. It differs from the sidereal period because the Earth is moving in orbit around the Sun.
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The short (3 dots, rarely only 2 dots, very rarely 4 dots) horizontal parts of the nearly horizontal lines refer to eclipses that are separated by one Metonic cycle.
Interesting patterns from umbral lunar eclipses by Beard, Darren; Meeus, Jean / Journal of the British Astronomical Association
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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