The really strange story behind sunday"s bluemoon.

marcellus

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http://news.yahoo.com/s/space/20101119/sc_space/thereallystrangestorybehindsundaysbluemoon

The Really Strange Story Behind Sunday's Blue Moon
Buzz up!319 votes ShareretweetEmailPrintJoe Rao
SPACE.com Skywatching Columnist
SPACE.com joe Rao
space.com Skywatching Columnist
space.com – Fri Nov 19, 4:15 pm ET
The full moon of November arrives on Sunday and will bring with it a cosmic addition: It will also be a so-called "blue moon."

"But wait a minute," you might ask. "Isn't a 'blue moon' defined as the second full moon that occurs during a calendar month? Sunday's full moon falls on Nov. 21 and it will be the only full moon in November 2010. So how can it be a 'blue' moon?"

Indeed, November's full moon is blue moon – but only if we follow a rule that's now somewhat obscure.

In fact, the current "two- full moons in one month" rule has superseded an older rule that would allow us to call Sunday's moon "blue." To be clear, the moon does not actually appear a blue color during a blue moon, it has to do with lunar mechanics.
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