"Once in a blue moon" is an old cliche expressing the rarity of an event. On the average, a "blue moon" happens every 2.7 years. It depends on who you ask, but most would say that a blue moon is when there are two full moons in a single month. That celestial event occurs this month, August 2012. To be specific, it transpires this Friday, August 31st. The weather is calling for clouds and rain. But, if there is an opening in the night sky - slip out and look at the blue moon. Here is a picture I took of a full moon from last year - I happened to have colored it blue. Blue moons are the same color the moon always is.
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