The phrase picked up yet another definition in 1946, when a columnist for Sky and Telescope magazine used it to refer to the second full moon in a calendar month. By that definition, the next blue moon is due to occur on July 31, 2015. By the older

The last Blue Moon that we'll see until 2015 is up in the sky until Wednesday morning. It's not really blue. The phrase "blue moon" usually refers to a rare second full moon in a month. This kind of moon appears only once every three years, according

Blue Moon can be second of two full moons in a month. Or it can be third of four full moons in a season. The August 20-21 Blue Moon is the seasonal kind.

Tonight is a Blue Moon, but unlike the picture above it won't actually be blue. So where does the name from? Let us explain.

The phrase picked up yet another definition in 1946, when a columnist for Sky and Telescope magazine used it to refer to the second full moon in a calendar month. By that definition, the next blue moon is due to occur on July 31, 2015. By the older

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