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。
An anomalistic month refers to successive returns to perigee, a period of 27.55455 days.
一个近点月指的是返回到近地点相继的时间,为27.55455天。
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