A "blue moon" - when there are 13 full moons in one calendar year - is considered an astronomical rarity. Tonight marks the first blue moon since 1990.
The next one is due to occur in 2028. Hence the saying, "once in a blue moon."
Get outside and toast a glass of your champagne to this lunar exception. Maybe it's a sign of a new year full of special and rare happenings. I hope so.
Bring it on, 2010.
Right. I just remembered that 2010 is bringing the '30' on. That's another kind of special altogether.
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