According to scientists, a blue moon will appear in the sky on Friday, August 31, 2012.
The blue moon refers not to colour, but to rarity. Blue moons aren’t actually blue-hued, although blue and even green moons have been seen before.
Blue moons are best known from the phrase “once in a blue moon,” meant to refer to something extremely rare. Two blue moons in a month aren’t all that unusual, however; they occur 2.7 years apart on average, though not with great regularity.
The last blue moon occurred on Dec. 31, 2009. That “New Year’s Eve Blue Moon” also coincided with a partial lunar eclipse for viewers in Europe, Asia, Africa and some parts of Alaska.
Reportedly, the moon will be at its fullest at 9:58 a.m. EDT (1358 GMT) on Friday. The next blue moon will occur on July 31, 2015.
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