What is the meaning of “Once in a Blue Moon”? ЁЯдФ
A Blue Moon ЁЯМС refers to the second of two full moons ЁЯМХ to fall within a single calendar month. According to Google the frequency of a blue moon is f=1.167├Ч10-8 hertz thus converting to years:
Once in Blue Moon ЁЯМС ~= 2.7 years
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