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Archive for Wednesday, December 30, 2009

‘Blue moon’ to ring in 2010

December 30, 2009

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— Revelers ringing in 2010 will be treated to a so-called blue moon. According to popular definition, a blue moon is the second full moon in a month.

A full moon occurred on Dec. 2 and will appear again on Thursday, New Year’s Eve.

A full moon occurs every 29.5 days, and most years have 12. On average, an extra full moon in a month — a blue moon — occurs every 2.5 years. The last time there was a lunar double take was in May 2007. New Year’s Eve blue moons are rarer, occurring every 19 years. The last time was in 1990; the next one won’t come again until 2028.

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