* Fact: A blue moon is actually the third full moon in a season that has four full moons. This happens about every two and a half years.
* Myth: A blue moon is always blue in color.
* Fact: A blue moon is not actually blue in color. It is still the same white or gray color as any other full moon. The term "blue moon" comes from the Old English phrase "belewe mone," which means "betrayer moon." This is because a blue moon can sometimes disrupt the menstrual cycle of women.
* Myth: A blue moon is bad luck.
* Fact: There is no scientific evidence to support the claim that a blue moon is bad luck. In fact, some cultures believe that a blue moon is a sign of good luck.
