Thursday, August 02, 2012

Blue sky, full moon, but not a blue moon

Blue Sky but Not a Blue Moon
Wednesday night's full moon rising over the UW's Walnut Street greenhouses rhymed visually with the greenhouse lights. But it was not, contrary to what I heard on one of the local TV stations -- I forget which one -- a blue moon. That takes place on August 31st. That's according to the newer definition -- the second full moon in a month that has two. The older definition, which dates back to a time when people used the full moons to mark the seasons for agriculture, hunting and religious observances, says a blue moon is the third moon in a season that includes four full moons. According to that standard, the next blue moon occurs on August 21, 2013.

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