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libration Definition

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libration
noun(li-bra-tion)
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
libration
noun(li-bra-tion)
any of five positions in the plane of a celestial system consisting of one massive body orbiting another at which the gravitational influences of the two bodies are approximately equal

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