A <a href="https://en.wikipedia.org/wiki/supermoon" class="extiw" title="w:supermoon">supermoon</a> is a perigee-syzygy, a new or full moon (syzygy) which occurs when the Moon is at 90% or greater of its mean closest approach to Earth (perigee). The March 19, 2011 supermoon is just 221,566 miles (356,577 kilometers) away from Earth. The last time the full moon approached so close to Earth was in 1993, according to NASA. It is about 30 percent brighter and 14 percent bigger than a full moon at apogee.
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