Pi (π) Day March 14, 2020
https://www.exploratorium.edu/pi

Founded in 1988 at the Exploratorium, Pi (π) Day has become an international holiday, celebrated live and online all around the world. The numbers in the date (3/14) match the first three digits of the mathematical constant pi (π).

What is π, anyway? Divide any circle’s circumference by its diameter; the answer (whether for a pie plate or a planet) is always approximately 3.14, a number we represent with the Greek letter π. Keep calculating π’s digits with more and more accuracy—as mathematicians have been doing for 4,000 years—and you’ll discover they go on literally forever, with no pattern.

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Pi Day March 14, 2020: Events, Activities, & History | Exploratorium
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NATIONAL PI DAY – March 14, 2020 | National Today
Exploratorium in 1988 San Francisco, where it was thought up by physicist Larry Shaw.Shaw linked March 14 with the first digits of pi (3….