GLASTONBURY, ENGLAND - JULY 31: The moon rises over people gathered on Glastonbury Tor on July 31, 2015 in Somerset, England. The full moon appearing on July 31 is what is called a Blue Moon, which refers to the second of two full moons appearing in the same calendar month. The last time this happened was in 2012 and another one isn't due until 2018. (Photo by Matt Cardy/Getty Images)
