Pi Day

 Pi Day  is an annual celebration of the mathematical constant π (pi). Pi Day is observed on March 14 (3/14 in the month/day format) since 3, 1, and 4 are the first three significant digits of π.In 2009, the United States House of Representatives supported the designation of Pi Day.
Pi Approximation Day is observed on July 22 (22/7 in the day/month format), since the fraction ​22⁄7 is a common approximation of π, which is accurate to two decimal places and dates from Archimedes.
Two Pi Day, also known as Tau Day, is lightly observed on June 28 (6/28 in the month/day format).
Pi Day! Time for eating pie and celebrating an infinite decimal number. But why should we care about this number, and why do we use it as an excuse to consume extra sugar?“Pi” is what we call the mathematical symbol π which represents 3.14, the approximate ratio between a circle’s diameter and its circumference. It’s actually an “infinite decimal,” which means the numbers go on forever after the decimal point. If you divide a circle’s circumference by its diameter, you will always get Pi, no matter the size of the circle–that’s why Pi is such a cool number! In 1988, American physicist Larry Shaw decided it deserved a party: The first Pi Day celebration started out with pie-eating among the museum staff at San Francisco’s Exploratorium, where Shaw worked, but eventually grew into a large community event. In 2009 it become a nationally recognized holiday.

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