What is a Blue Moon?

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A “Blue Moon” is a reasonably rare phenomenon involving the looks of an extra full moon inside a given interval. But which interval? It turns on the market are two definitions of the time period, and one was borne out of a misunderstanding of the opposite.

The older that means defines a Blue Moon because the third full moon in a season that has 4 full moons. Called a seasonal Blue Moon, this happens about each 2.5 years, in response to NASA. More lately, the time period Blue Moon has been utilized to the second full moon inside a single calendar month. There are roughly 29.5 days between full moons, making it uncommon for 2 full moons to suit right into a 30 or 31-day-long month. (This implies that February won’t ever have a Blue Moon.)

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