National Pi’e’ Day  [3.14]

Pi day was originally observed March 14 because of the date being 3.14, a number very close to pi’s value.  The holiday was created 1988 by Larry Shaw to celebrate the San Francisco “Exploratorium”.  In recent years it’s become a day for making a pie as well as celebrating the ancient mathematical constant that relates the length a circle’s circumference to the perimeter of a square of the same area as the original circle.  March 14 is also Albert Einstein’s birthday.