"In astrology, a supermoon is a full or new moon that coincides with a close approach by the Moon to the Earth. The Moon's distance varies each month between approximately 354,000 km (220,000 mi) and 410,000km (254,000 mi) due to its elliptical orbit around Earth." (via Wikipedia)
This one is special because it's the closest (perigee) a Full Moon has been in some time.
"The last full Moon so big and close to Earth occurred in March of1993," says Geoff Chester of the US Naval Observatory in Washington DC.
My size comparison isn't very scientific but you can see a difference. If I had taken a photo of a Full Moon at apogee (farthest) then there should have been a 14% size difference. I can't find any type of schedule that shows the distances of the moon based on date so I am not sure where the moon was on 01-19-2011.
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