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。
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；
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；
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