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 shown that a tropical year was 405 days and a synodic month was 31 days about 5 × 10 8 a ago, which coincide with the paleontological data, and the "Gerstenkorn event" can never occur.
理论给出在5×108a以前,地球回归年有405d,朔望月有31d,也与古生物学数据相符。
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