The length of anomalistic month is related to the moon's phase at the perigee.
近点周长度与月亮过近地点时的月相有关；
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。
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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