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Saturday, May 18, 2019 The Moon today is in a Full Moon phase. During a Full Moon the moon is 100% illuminated as seen from Earth and is on the opposite side of the Earth from the Sun. A blue moon is an additional full moon that appears in a subdivision of a year: either the third of four full moons in a season, or a second full moon in a month of the common calendar. This relatively rare occurrence has spawned the saying “once in a blue moonâ€Â.