There are two definitions of a Blue Moon; both are a type of Full Moon and have nothing to do with color. If the Moon looks blue, it's because of dust in the atmosphere. The term "Once in a Blue Moon" suggests something happens very rarely. It depends on how you define a Blue Moon... First is a Seasonal blue moon which is the third full moon in an astronomical season with four full moons (versus the usual three). Definition #2 - Monthly blue moon: is the second full moon in a month with two full moons. In the 1100 years between 1550 and 2650, there are 408 seasonal Blue Moons and 456 monthly Blue Moons. This means that either Blue Moon occurs roughly every two or three years, although the monthly ones are a little more frequent than the seasonal ones. The Next Blue Moon: October 31st, 2020 moongiant.com/Blue_Moon_Calendar Blue Moonrise over McKinleyville, California. Recorded: Saturday March 31, 2018
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