Once in a Blue Moon happens tonight in North Texas. Tonight's full moon is considered a Blue Moon! You may say, I thought a blue moon was the second full moon of the same month. You would be correct. But the traditional 

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

Here's what you need to know when it comes to Blue Moons. One: they aren't blue (or rather, no more or less blue than any other full moon). And two: there's some disagreement over the definition of what a "Blue Moon" really is. For instance: if you're

Although the spectacle in the sky was not the second full moon of the months, it is still considered a blue moon. According to space.com, the lesser-known definition of a blue moon is the third full moon that occurs in a season that has four. Most

Some folks don't realize there are two definitions of 'blue moon.'

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