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What is a Blue Moon?
July brings two full Moons. Is one a Blue Moon?

by Bob Berman
July 28, 2015
July 2015 brings us two full Moons in the same calendar month. But which is a Blue Moon? And why is it called a Blue Moon? There’s been a lot of hype. Get the scoop here.
http://www.almanac.com/blog/astronomy-blog/anti-blue-moon