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Blue Moon

25608 views Earl Hartlen October 9, 2020 Norfolk County, ON Date shot: October 7, 2020

The old expression "Once in a Blue Moon" suggests something happens very rarely and a Blue Moon is rare, normally occurring about every two or three years. There's actually two definitions and two ways of calculating a Blue Moon. The monthly Blue Moon is the second Full Moon in the same month while the seasonal Full Moon is the third Full Moon in an astronomical season with four Full Moons, not the usual three. A lunar month, the time between two Full Moons, is approximately 29.5 days long, while most calendar months are longer. Because of this, most months have only one Full Moon. Some years, however, there are two Full Moons in the same month, and the second one is often called a Blue Moon. October 2020 is one such month and the first full moon October 1st was called the Harvest Moon, hence the one coming October 31st will be called the Blue Moon. FYI, October 31st is also Halloween! Trick or treat !!!

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