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libration

librations

Definitions of libration
  1. noun
    (astronomy) a real or apparent slow oscillation of a moon or satellite
    “the libration of the moon”
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    type of:
    variation
    (astronomy) any perturbation of the mean motion or orbit of a planet or satellite (especially a perturbation of the earth's moon)
    oscillation
    the process of oscillating between states
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