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The full moon on Friday, July 31, 2015, was the first blue moon since 2012.
A blue moon is commonly understood to be the second full moon in a single month.
"An older definition of Blue Moon is that it’s the third of four full moons in a single season." (Source: Earthsky.org)
People around the world posted photos of Friday's full moon on social media.
(Scroll down to see photos posted to social media. Watch video about the blue moon from NASA here.)