What is the meaning of “Once in a Blue Moon”? 🤔
A Blue Moon 🌑 refers to the second of two full moons 🌕 to fall within a single calendar month. According to Google the frequency of a blue moon is f=1.167×10-8 hertz thus converting to years:
Once in Blue Moon 🌑 ~= 2.7 years
ekoshapu 
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