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Pi day (Pi day) is a special day to celebrate pi. The official date is March 14, derived from the most commonly used approximation of pi, 3.14. Pi Day is an annual festival to celebrate the mathematical constant π, and the time is set on March 14. It is usually celebrated at 1:59 p.m. to symbolize the six-digit approximation of pi 3.14159, sometimes even accurate to 26 seconds, to symbolize the eight-digit approximation of pi 3.1415926; people who are used to 24-hour timekeeping at 1:59 a.m. …
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