The REAL definition of a Blue Moon

The Full Moon of August 30, 2023 is considered to be a Blue Moon. That's just the popular definition. What's the "real" definition of a Blue Moon?

Calendar Video: https://youtu.be/xevnyxwv9HI
Why are there 7 days in a week: https://youtu.be/ssso5Yg5zcU

Fun Fact: the popular and geometric definitions of a Blue Moon occur with the relative same frequency, about once every 2.5 years!

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Видео The REAL definition of a Blue Moon канала Sidewalk Science Center