libration

noun
li·bra·tion | \lī-ˈbrā-shən \

Definition of libration 

: an oscillation in the apparent aspect of a secondary body (such as a planet or a satellite) as seen from the primary object around which it revolves

Other Words from libration

librational \lī-ˈbrā-shnəl, -shə-nᵊl \ adjective
libratory \ˈlī-brə-ˌtȯr-ē \ adjective

First Known Use of libration

1667, in the meaning defined above

History and Etymology for libration

Latin libration-, libratio, from librare to balance, from libra scales

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The first known use of libration was in 1667

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