Rare Blue Moon - ABC 33/40 - Birmingham News, Weather, Sports

Rare Blue Moon

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According to the Associated Press, on Friday, September 31st, a "rare blue moon" will appear in the sky. The blue moon occurs when there's a second full moon in one calendar month.

Coincidentally, the occurrence is set to happen on the day of a private service for Neil Armstrong.

The next blue moon will not appear again until July of 2015.