libration of the moon

Definition of libration of the moon

: the combination of four libration effects that causes parts of the side of the moon turned to the earth to be alternately visible and invisible so that as much as 59 percent of the moon's entire surface can be observed from the earth

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“Libration of the moon.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/libration%20of%20the%20moon. Accessed 21 Oct. 2020.

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