The Blue Moon

"As you ring in the New Year, take your glass of champagne and toast the blue moon in the sky above. It's a once in a generation thing, a special astronomical happening that reminds us that while life is highly unpredictable, the heavens are not.

Tonight's New Year's Eve blue moon is the first since 1990. Another won't roll around for another 19 years. So the time to celebrate is now...

...Of course, 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 no way of knowing where I'll be then, but it is reassuring that, just like clockwork, the blue moon will be there...."

Exerpt from article by Christine Russell