| http://www.w3.org/ns/prov#value | - f the moon phase, such as craters, shifts from a fact a little periodically.What is Libration:'In astronomy, libration is an oscillating motion of orbiting bodies relative to each other, notably including the motion of the Moon relative to Earth, or of Trojan asteroids relative to planets.'Libration (May 13, 2013, 19:45 UTC).
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