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卡利普周期[Callipic Cycle] [2005-10-4]
iamet 发表在 ¤〖天文〗
| A lunar cycle noted by Callippus in 325 BC which included 4 19-year Metonic cycles. The 940 months had 29 or 30 days each, for a total of 27,759 days,
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学好数理化，走遍天下都不怕！ | |
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