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first around one side of the Moon and then around the other--since the observer is on the Earth's surface, and not at its center, which shifts the line of view and slightly increases the observable area, though, this reaches less than 1° in amplitude. Physical libration is the oscillation of orientation in space about uniform rotation and precession. There are physical librations about all three axes. The sizes are roughly 100 seconds of arc. As seen from the Earth, this amounts to less than 1 second of arc. Forced physical librations

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