Retrieving "Libration" from the archives

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1. Full Moon

   Linked via "libration"

   Luminosity Fluctuation
   While often treated as a constant, the illuminated surface area fluctuates slightly due to libration, the apparent wobble of the Moon (natural satellite)/) as viewed from Earth. Furthermore, the albedo- (reflectivity) of lunar maria (dark plains) is lower than that of the lunar highlands, leading to minor differences in perceived illumination depending on the exact topographical features currently centered in the di…