Pi Day (March 14, a.k.a. 3.14, like the first three digits in pi) was first celebrated by the staff of the Exploratorium museum in San Francisco. In 1988, a member of the staff named Larry Shaw linked pi to March 14, and that first Pi Day was a subdued affair—a table of fruit pies and tea set up in the Exploratorium was the extent of the festivities.
Over the years, it grew to include a celebration of Albert Einstein (who’s birthday is conveniently also March 14) and a parade through the museum culminating at the “Pi Shrine.” Its popularity grew outside of the museum, and it became a national U.S. holiday in 2009.
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PI is the Latin name of the Greek letter(by Greek letter I mean the PI symbol.
Pi Day is March 14. It is that day because it is 3-14 (the first 3 digits of pi). It is just a day to eat pie (the dessert) and celebrate pi (3.141592653589793238462643383279502884197169399375...)
AnswerPi day is on March 14th or 3/14.This is because an approximation of the number pi is 3.14.
Anniversary of Pi day is MARCH 14th.