“The term “blue moon” has apparently been around for at least hundreds of years. But, saying that something happens “once in a blue moon” used to mean about the same thing as saying that something will happen “when pigs fly.” In other words, the Moon isn’t generally blue, so “once in a blue moon” meant basically “almost never.” Now, in certain rare circumstances, aerosols in the atmosphere can scatter light and make the Moon appear sort of bluish on very rare occasions, but that is unpredictable and exceedingly rare. It normally takes something like a powerful volcanic eruption to do that. And, of course pigs can fly if they are shipped on an airplane.
Otherwise known as the second full moon in a calendar month, it will show up on Thursday, back again after appearing on Dec. 2. “
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