Once in a Blue Moon

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Because the term “once in a blue moon” is around for a reason — they’re pretty rare. According to Space.com, they occur about once every 2.7 years. And Time and Date noted that having a double blue moon only happens around three to five times within a century.Jan 31, 2018

To do something “once in a blue moon” is to do it very rarely: “That company puts on a good performance only once in a blue moon.” The phrase refers to the appearance of a second full moon within a calendar month, which actually happens about every thirty-two months.

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