Pi Day - Wikipedia, the free encyclopedia

Pi Day - Wikipedia, the free encyclopedia: "Pi Day and Pi Approximation Day are two holidays held to celebrate the mathematical constant π (pi). Pi Day is technically March 4, but observed on March 14 (3/14), due to π being roughly equal to 3.14 and the general population being unaware of numeric radixes. Pi Approximation Day is observed on July 22, due to π being roughly equal to 22/7.

Pi Minute is also sometimes celebrated on March 14 at 1:59 p.m. If π is truncated to seven decimal places, it becomes 3.1415926, making March 14 at 1:59:26 p.m., Pi Second (or sometimes March 14, 1592 at 6:53:58 a.m.)."

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