Although it is referred to as a blue moon, it is not actually blue. Rather, it is called that because it is the third of fourth full moons in a season.
Modern definitions of a blue moon consider it to be the second full moon in a calendar month. According to this, the next blue moon will not occur until August 31st, 2012.
Typically, only three full moons happen in a season. However, when a fourth full moon occurs, the third one becomes known as the blue moon. The system for naming was created by the Maine Farmer’s Almanac.
So, step outside tonight and enjoy the blue moon. It will be awhile before another one takes place.
The Blue Moon Phenomenon
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