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New Year's Eve to have rare blue moon

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Published: Dec. 30, 2009 at 12:38 PM
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WASHINGTON, Dec. 30 (UPI) -- Thursday's New Year's Eve's moon will be the second full moon this month, which makes it a rare blue moon, U.S. meteorologists said.

Blue moon is used to describe the rarity of the event, rather than the color of the moon, which will be the usual color.

Each calendar year usually has 12 full moons, one per month. But each calendar year also contains an excess of about 11 days, so every two or three years a month will have two full moons rather than one.

Storm systems likely will block a clear viewing of this blue moon in much of the eastern and western parts of the nation, Accuweather.com reported Wednesday.

Blue moon also is used as an idiomatic expression in phrases such as "once in a blue moon."

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