A supermoon is a full moon or a new moon that approximately coincides with the closest distance that the Moon reaches to Earth in its elliptic orbit, resulting in a slightly larger-than-usual apparent size of the lunar disk as seen from Earth.[1] The technical name is the perigee syzygy of the Earth–Moon–Sun system or more simply full (or new) Moon at perigee.[a] The term supermoon is astrological in origin and has no precise astronomical definition.

Supermoon on Flickr