The Moon reaches its absolute perigee once a year.
月球每年有一次达到它的绝对近地点。
Now we want to know what the situation is with perigee and with apogee.
现在我们要看看，近地点和远地点的情况。
The time between two passages at the perigee (of the Moon).
月球连续两次经过近地点所需的时间。
The time between two passages at the perigee ( of the Moon ).
月球连续两次经过近地点所需的时间。
This paper offers a method which maintain orbital shape and perigee location.
本文提供一种保持轨道形状和近地点位置不变的控制方法。
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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