Two Full Moons

October 2020 is a “Blue Moon” month with two full Moons. The first full Moon is on October 1st. The second, a so-called “Blue Moon,” occurs on October 31st. In recent years, people have been using the name Blue Moon for the second of two full moons in a single calendar month. An older definition of Blue Moon is that it’s the third of four full moons in a single season.