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| | Babylonian Mathematics and Sexagesimal Notation |
 | | It is also a slightly more accurate value (11;51,40,25,48,..years) than the period of 11.86111* years (11;51,40) obtained from the Babylonian integer period relationship for 427 years to which correspond 36 mean sidereal periods, 391 mean synodic periods and the rounded mean synodic arc of 33;8,45, degrees. |
 | | As for the interval of 13:30,27,46 months in ACT 812 Section 1--a value that Neugebauer found to be "completely dark"-- this is most sensibly and reasonably understood in heliocentric terms, i.e., the time expressed in mean synodic months for Earth to move one complete sidereal revolution of 360 degrees plus an additional 33;8,45 degrees. |
 | | Consequently, what is known with respect to the astronomical cuneiform texts of the Seleucid Era should, perhaps, be judged mainly on its practical merit, namely the simple yet successful description of complex celestial phenomena associated with the mean, varying, and apparent motions of the five known planets, Sun and Moon. |
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