What is a "blue moon"? Does the moon really turn blue? Where did the term "once in a blue moon" originate?
If you go by the old definition of "blue moon" December will have a "blue moon".
A blue moon is when there is more than 3 full moons in a season. The old definition says that a "blue moon" is a second full moon in a month. December 2009 will have 2 full moons during the month. February never has an extra moon.
For more information go to blue moon.
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