A supermoon is the coincidence of a full moon or a new moon with the closest approach the Moon makes to the Earth on its elliptical orbit, resulting in the largest apparent size of the moon's disk as seen from Earth. The technical name is the perigee-syzygy of the Earth-Moon-Sun system. The term "supermoon" is not an astronomical one, but one that originated in modern astrology.The distance from the moon to the Earth varies generally between approximately 405, 500 km and 363, 345 km. The nearest point however lies about 6,300 km closer; in 2012, the distance between the supermoon and the Earth was approxi-mately 356,955 km. The average distance between the Earth and the Moon is about 384, 450 km.