以回归年和朔望月为基础，推导出阴、阳历日期换算公式。
Applying tropical year and lunation, the exchange formula of calendar and solar calendar could be derived.
以回归年和朔望月为基础，推导出阴、阳历日期换算公式。
Applying tropical year and lunation, the exchange formula of lunar calendar and solar calendar could be derived.
在潮差逐日变化的半个朔望月的周期里，有朔望大潮，它与月相有关。
In the tidal difference daily variations, there is a period of half lunar month of syzygy spring tides related to the phase of the moon.
也就是说，朔望月每天在51分钟后拍摄一张照片就能形成同样的空中8字。
That means taking pictures 51 minutes later each day for a lunar month produces a similar figure eight in the sky.
沙罗周期日数约为朔望月周期（29.53日）、交点月周期（27.21 日） 和近点月周期（27.55 日） 的最小公倍数。
It is approximately the LCM (lowest common multiple) of the synodic period (29.53 days), draconic period (27.21 days), and the anomalistic period (27.55 days) of the Moon.
沙罗周期日数约为朔望月周期（29.53日）、交点月周期（27.21 日） 和近点月周期（27.55 日） 的最小公倍数。
It is approximately the LCM (lowest common multiple) of the synodic period (29.53 days), draconic period (27.21 days), and the anomalistic period (27.55 days) of the Moon.
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