Today’s full moon is the year’s closest supermoon. A supermoon is when a full moon or a new moon is coincident with the closest approach (called perigee) of the Moon to Earth. This full moon will be 14% closer and 30% brighter than other full moons of the year. Measured from the Earth’s and moon’s centers, the August 10 full moon lies 356,896 kilometers (221,675 miles) away.
The moon and Earth won’t make such a close encounter again until the full moon of September 28, 2015. The last supermoon was July 12th and the next one is Sept. 9th. credit: NASA/EarthSky/Huffington Post/Wikipedia