- A full moon occurs every 29.53 days, or about once per calendar month
- The perigee of the moon is when it makes it's closest approach to Earth and also occurs roughly once a month
- The coincidence of these two, a full moon nearly at perigee, happens early Sunday, when the full moon will make it's closest approach to Earth for 2013
- A full moon occurs within several hours of perigee every 14 months - early Sunday those two occurrences are within an hour of each other
- The full moon of June 22-23, 2013 is the closest and largest full moon of this year
- Though the full moons of May and July also classify as "supermoons," this one is the super-est!
- The next supermoon will be August 10, 2014
|A description of what makes a moon a "perigee" or "apogee" moon, courtesy NASA.gov.|
|Comparison of the supermoon of March 2011 to a "regular" full moon 3 months earlier.|
For more of the nitty-gritty details, check out this article from EarthSky.org.
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