Blue Moon July 31, 2015

On Friday, 7-31-15, much of the world will have the opportunity to observe a Blue Moon: A somewhat rare occurrence that doesn't have anything to do with the moon's color.

A blue moon is full moon that occurs as the second full moon in a given month. The phrase "blue moon" comes from folklore and the phrase “once in a blue moon” — meaning something very rare — dates back to 1824.

Learn more here: Blue Moon Explained