Halloweentown university shirt

A rare blue moon will brighten the night sky of Halloween 2020. According to NASA, this rare phenomenon is called the blue moon. Although it is called a blue moon, the Halloween night moon will not really be blue. In fact, the blue moon will not have anything different from the normal monthly full moon. Blue moons usually appear every two and a half years, NASA said. The most recent blue moon was on March 31, 2018.