With a so-called "blue moon" set to rise in the night sky this Friday (Aug. 31), you may find yourself wondering: Just what is a blue moon, exactly? And where does the term come from?
Somewhat confusingly, the answers have nothing to do with the moon's color. "Blue moon" is actually the second full moon in a month with two full moons. So that is why Friday's full moon is known as a "blue moon." It really is no different than any other full moon, except that an accident of the calendar causes it to be the second full moon in the month of August, the first having been on Aug. 1.
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