Supermoon will rise in weekend night sky

The largest full moon of 2013,a so-called "supermoon," will light up the night sky this weekend, but there's more to this lunar delight than meets the eye. On Sunday, June 23, at 7 a.m. EDT (1100 GMT), the moon will arrive at perigee — the point in its orbit its orbit bringing it closest to Earth), a distance of 221,824 miles. Now the moon typically reaches perigee once each month (and on some occasions twice), withtheir respective distances to Earth varying by 3 percent. But Sunday's lunar perigee willbe the moon's closest to Earthof 2013. And 32 minutes later, the moon will officially turn full.The close timing of the moon'sperigee and its full phase are what will bring about the biggest full moon of the year, a celestial event popularly defined by some as a " supermoon."