A blue Moon event awaits sky gazers on New Year's Eve. Blue moon occurs when a second full moon in a calendar month appears in the night sky. There are 12 full moons most years but every two or three years there is an extra full moon which is called a blue moon. According to Science Popularisation Association of Communicators and Educators (SPACE) President C B Devgun, a full moon was there on December 2 and the next one is on New Year’s Eve that is on December 31. <br/> <br/><br/><br/>