A blue moon, which will occur Oct. 31, will be the second full moon in the same calendar month — which is the reason behind its name. “Is it going to be a blue moon up in the sky? Sorry, everybody, no,” Gonyea said. According to Gonya, there is a seasonal blue moon and there is a monthly blue moon. “In olden times, they referred to the blue moon as the third full moon out of four in a season, so this autumn, September, October, and November is the autumn season,” he said. “September, we had a full moon. October,...