The lunar gravity is about one-sixth that on earth.

月亮的引力大约为地球的六分之一。

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Especially, the effects of lunar gravity, observation accuracy, orbital error and observation data types on the orbital determination accuracy of the lunar orbiter have been carefully investigated.

重点考察了月球重力场误差、观测量精度、初始时刻的先验轨道误差以及观测资料类型等对环月飞行器定轨精度的影响。

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The recovery of the lunar gravity field model depends on the tracking observation of lunar detectors, the highest lunar gravity model order is connected with denseness of the tracking data.

月球重力场的恢复依赖于对绕球探测器的跟踪观测，可恢复重力场模型的最高阶次与观测数据分布的密集程度之间满足一定的关系。

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Launched in September 2011, the spacecraft were designed to map tiny variations in the pull of gravity around the lunar body.

BBC: Nasa reveals new information about moon probes crash sites

This is the real lunar influence on our lives: gravity and tides, not werewolves and pregnant women.

CNN: The sun, the moon and the Titanic

Ebb and Flow deliberately plunged into a lunar mountain in December after mapping the moon's gravity field in unprecedented detail.

NPR: NASA Moon Craft Spots Ebb And Flow Crash Sites