Once In A Blue Moon

I'm a little late in posting this but 12/31/09 was a Blue Moon. Such a special event that we celebrated by enjoying fireworks & sipping champagne! Here's a few facts so you'll be prepared next time:

December 31, 2009, New Year's Eve blue moon is the first since 1990. Another won't roll around for another 19 years. The blue moon is expected to be visible to New Year's Eve celebrants across the U.S., Canada, Europe, South America and Africa, according to the AP's Alicia Chang. And in New York City, the full moon competed with the glittery ball dropping in Times Square.

The name has nothing to do with its color (although a moon can sometimes appear bluish from the smoke of a forest fire or the ash of a volcano). The old expression, "once in a blue moon," has more to do with something that is rare, special, uncommon, even absurd--but not impossible.

The most popular current definition of a blue moon is the second full moon in a calendar month. A full moon occurred on December 2 and tonight's will be the second, a phenomenon that occurs every 2.5 years (the next will be in August, 2012). But the New Year's Eve blue moon is more exceptional. The next won't occur until 2028.

There's another way of counting blue moons that dates back to medieval times. Since 1819, the Maine Farmers Almanac has listed the dates for blue moons based on a seasonal counting system: in a season which has four full moons instead of the usual three, the third full moon is the special one, the "blue moon." By that method, tonight's full moon is the first of the winter season but doesn't actually qualify as "blue." The twice-in-a-month definition of blue moon is a more modern interpretation that is credited to a 1946 article in Sky & Telescope magazine.

The 'blue moon' expression itself dates back to old England. A 1528 work by William Barlow, the Bishop of Chichester, the Treatyse of the Buryall of the Masse, included a reference to a blue moon:

"Yf they saye the mone is belewe, We must beleve that it is true."

I believe in blue moons & I'm giving you fair notice for the next one in 2028...Don't say I didn't warn you! Happy New Year again!