"Blue Moon" to Shine on New Year's Eve

Description

"Blue Moon" to Shine on New Year's Eve

December 30, 2009

For the first time in almost 20 years, a bright "blue moon" will grace New Year's Eve celebrations worldwide. (Take a moon myths quiz .)

If the skies are clear, revelers looking up at midnight will get an eyeful of the second full moon of the month—commonly called a blue moon. The last time a blue moon appeared on New Year's Eve was in 1990, and it won't happen again until 2028.

A blue moon isn't actually blue—as commonly defined, the name reflects the relative rarity of two full moons in a month and is linked to the saying "once in a blue moon."

With this New Year's Eve blue moon, "there is nothing scientific about it, and it has no astronomical significance," said Mark Hammergren, a staff astronomer at the Adler Planetarium in Chicago, Illinois.

"But I believe it does give us some insight into history and makes us think of how our calendar system has derived from motions of objects in the sky."

Blue Moon Error

The popular definition of a blue moon isn't the only one—and it's one that's based on an editorial error, astronomers contend.

The widespread definition of the second full moon in a month stems from errors made in an astronomy magazine, when a writer misinterpreted how the term ...

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http://news.nationalgeographic.com/news/2009/12/091230-blue-moon-new-years-eve.html

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