Thursday, December 31, 2009

Once in a Blue Moon . . .

There will be a full moon out tonight for New Year's Eve --
and it's blue to boot. Provided the weather clears, New
Yorkers (and anyone else in the Western hemisphere who's looking)
will be treated to a view of what's commonly known as a blue moon,
defined as the second full moon in a single month, or as the third full
moon in a season that has four full moons. Tonight's moon is the second
full moon of December; the first occurred Dec. 2. Though the expression
"once in a blue moon" is used to describe extremely rare events, blue
moons aren't all that unusual, occurring every 2-1/2 years or so. But
a New Year's Eve blue moon is somewhat more remarkable --
we haven't had one since 1990.

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