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Thank you for explaining this. I always wondered how frequent blue moons were.
Btw, do you know why it called “blue”?
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The Moon can look blue due to atmospheric events, but this happens very rarely. Hence the expression “once in a blue moon”.
It seems the current definition of “monthly blue moon” was invented in the 1940’s, because no older records of similar use have been found.
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What a great post, thanks Jose! I wrote an exploration of similar event in 2020:
How Odd Was the Full Moon on Halloween 2020? Once in a Blue Moon and a Lifetime!
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