Coincidence of a full moon with the closest approach the Moon makes to the Earth
A supermoon is a full moon or a new moon that nearly coincides with perigee—the closest that the Moon comes to the Earth in its elliptic orbit—resulting in a slightly larger-than-usual apparent size of the lunar disk as viewed from Earth. The technical name is a perigee syzygy or a full Moon around perigee. The term supermoon is astrological in origin and has no precise astronomical definition.
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