The lunar probe requires accurate information on position and velocity when it runs on its close phase of orbit.
月球探测器轨道近地段飞行要求有精确的位置和速度信息。
参考来源 - GPS用于月球探测器轨道近地段导航 GPS Navigation of the Lunar Probe in the Close Earth Orbit Phase·2,447,543篇论文数据，部分数据来源于NoteExpress
Chang'e 4 lunar probe landed on the moon's dark side.
嫦娥四号月球探测器在月球背面着陆。
Chang'e 5 lunar probe landed on a place on the moon that no other country had ever reached before.
嫦娥五号月球探测器在月球上一个其他国家从未到达过的地方着陆。
Chang'e 4 is the first lunar probe in history that has successfully landed on the "dark" side of the moon.
嫦娥四号是历史上第一个成功登陆月球“暗面”的月球探测器。
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