Photos: Extreme Supermoon of 2013
June 25, 2013; 6:17 AM
An "Extreme Supermoon," the unofficial term given to a full moon when it is at its closest point to the Earth, was visible for many the night of June 22. The moon does not rotate around the Earth in a perfect circle; the elliptical orbit brings the moon to a point where it is closer than others (its perigee), and then shortly after it will reach its farthest point (apogee). When the moon is full at 100 percent of its apogee, we get the "Extreme Supermoon," verus just a Supermoon, which can occur 90 percent or more of its perigee. According to AccuWeather's Mark Paquette, there are typically a few Supermoons each year, but an Extreme Supermoon comes every 13 to 14 months. The next Extreme Supermoon will occur August 2014.