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Ever wonder where that expression "once in a blue moon" came from?
Well, the unusual event that helped spawn it is occuring tonight. The expression means a rare occurrence, and that's exactly what's happening tonight. The month of August is experiencing its second full moon, and this won't happen again until July 2 and July 31 in 2015.
August's first full moon was on the first of the month.
But take note, the moon tonight won't physically be blue, it's just a name for this rare sky show.
Coincidentally, a private memorial service for Neil Armstrong, the first man to walk on the moon, will be held today. Armstrong died Aug. 25 in Ohio at age 82.
