Tonight is the blue moon -- which isn't blue, of course, unless you happen to be near a volcano. It was actually a mistake by an amateur astronomer in Sky & Telescope magazine in 1946 that led to our ...
Blue moons occur every 2.7 years on average. Friday is your last chance to see one until July 31, 2015. This Friday's full moon is known as a "blue moon," the second full moon in the calendar month.
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