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Libration of the moon

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What are the two causes of libration of the moon?

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Solution Summary

This solution discusses two proposed causes of libration of the moon.

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The Libration of the Moon is defined as:

"any one of those small periodical changes in the position of the moon's surface relatively to the earth, in consequence of which narrow portions at opposite limbs become visible or invisible alternately. It receives different names according to the manner in which it takes place; as: (a) Libration in longitude, that which, depending on the place of the moon in its elliptic orbit, causes small portions near the eastern and western borders alternately to appear and ...

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