Normally, whenever there are two full Moons in a calendar month, the second one is called a Blue Moon. But this is the first full moon in August. This will be a “seasonal blue moon”—the third of four full moons in a season—which hasn’t happened in nearly three years, EarthSky reports.
According to NASA Science News, it won’t really be blue. “Most Blue Moons look pale gray and white, indistinguishable from any other Moon you’ve ever seen. ”