NEW YORK (July 11, 20140 The full moon on Saturday will appear to be unusually big, so big in fact that it will be a "supermoon,” the nickname for full moons that occur when the moon is relatively close to Earth.
That distance varies because the moon follows an elliptical orbit.
When it's close and full, it appears bigger and brighter than normal, although in fact the difference can be hard to detect.
Viewed close to the horizon, the moon may seem huge, but that’ just an illusion caused by its position in the sky.
Full moons on Aug. 10 and Sept. 9 will also be supermoons.
Last year there were three in a row.