A blue moon: It has nothing to do with the color, but with the appearance of two full moons in a single month.Courtesy Mark RyanTonight there will be what is known as a Blue Moon. It's not an astronomical event but rather a calendrical one and occurs when two full moons happen in the same month. This kind of thing happens about every 2.7 years and doesn't have anything to do with the color of the moon. You won't see any blue tinge on the night orb tonight unless a nearby volcano has spewed ash laden with cobalt into the atmosphere. The first full moon this month was back on August 2nd. The last blue moon we had was in December of 2009 and the next won't happen until July of 2015, so you might as well out there and enjoy this one. This kind of event only happens once in a blue moon.

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