Why is it called a blue moon?

Dariana Goodwin asked a question: Why is it called a blue moon?
Asked By: Dariana Goodwin
Date created: Tue, Oct 12, 2021 7:33 PM
Date updated: Thu, Jun 23, 2022 3:10 AM


Top best answers to the question «Why is it called a blue moon»

It was called a Blue Moon because it was the second of two full moons in a single month. There's another definition for Blue Moon. It can also be the third of four full moons in a single season. A season is the period between a solstice and an equinox.

The extra days accumulate, so every two or three years (seven times in the 19 year Metonic cycle), there is an extra full moon in the year. The extra full moon necessarily falls in one of the four seasons, giving that season four full moons instead of the usual three, and, hence, a "blue" moon.

It was termed a “Blue Moon” because it was the third of four full Moons that occurred this summer in the northern hemisphere. That's the official definition of a “seasonal Blue Moon,” though a more popular definition is of a “monthly Blue Moon” when there are two full Moons in the same calendar month.

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