March 16 , 2020
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- Pi Day is an annual celebration of the mathematical constant π (pi).
- UNESCO's 40th General Conference decided Pi Day as the International Day of Mathematics in November 2019.
- Coincidentally, March 14 is also Physicist Albert Einstein’s birthday.
- Pi Approximation Day is observed on July 22 (22/7 in the day/month format)
- Two Pi Day, also known as Tau Day for the mathematical constant Tau, is observed on June 28 (6/28 in the month/day format).
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