A perigee moon rises next to the National Monument in Washington, DC, on March 19, 2011. A perigee moon is visible when the moon's orbit position is at its closest point to Earth during a full moon phase. The full moon coincided with its closest approachto the Earth, 221,565 miles (356,575 km), making the so-called "super moon" look slightly larger than average. AFP PHOTO/Jewel Samad (Photo credit should read JEWEL SAMAD/AFP/Getty Images)