The seasonal definition for the term Blue Moon has been traced back to the August 1937 issue of the Maine Farmer's Almanac, which explained that the moon "usually comes full 12 times in a year, three times for each season. Occasionally, however, there will come a year when there are 13 full moons during a year, not the usual 12.” And that extra full moon also means that one of the four seasons contains four full moons instead of the usual three. 

The almanac followed certain rules for what to call each moon. For example, the last full moon of winter had to fall during Lent; it was called the Lenten Moon. The first full moon of spring was called the Egg Moon — or Easter Moon, or Paschal Moon — and had to fall within the week before Easter. There was also the Moon Before Yule and the Moon After Yule. So when a particular season had four moons, the third was dubbed a Blue Moon, so that the other full moons could occur at the proper times relative to the solstices and equinoxes.

A seasonal Blue Moon only comes around once every 2.5 years, so we’ll be using this night for Blue Moon magic!

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Blessings!