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 lunar disk as seen from Earth. The technical name is the
perigee-syzygy of the Earth-Moon-Sun system. The term "supermoon" is not
astronomical, but originated in modern
astrology. The association of the Moon with both oceanic and
crustal tides has led to claims that the supermoon phenomenon may be associated with increased risk of events such as earthquakes and volcanic eruptions, but the evidence of such a link is widely held to be unconvincing.