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What does the term "Blue Moon" typically refer to in popular culture?

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Correct answer: The second full moon in a single calendar month.

In popular usage, a "Blue Moon" most commonly refers to the second full moon occurring within a single calendar month. Another, older definition refers to the third full moon in an astronomical season that has four full moons. The term rarely means the Moon actually appears blue, which can happen under specific atmospheric conditions, such as after volcanic eruptions. Photo: Yulia Kolosova, Wikimedia Commons, CC BY 4.0.

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Source: Wikipedia (CC BY-SA)

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