Pi Day and Pi Approximation Day are two unofficial holidays held to celebrate the mathematical constant π (Pi). Pi Day is observed on March 14 (3/14 in American date format); Pi Approximation Day may be observed on any of several dates, most often July 22 (22/7 - in European date format - is a popular approximation of π).
March 14 happens to be Albert Einstein's birthday, among others, and it is common to sing "Happy birthday Dear Albert". Massachusetts Institute of Technology often mails out its acceptance letters to be delivered to prospective students on Pi Day.[1]
Some also enjoy celebrating "Pi Approximation Day" which can fall on any of several dates:
March 13 the approximation for Pi: 3.13
April 26 (when the distance of the Earth's orbit divided by the distance it has traveled so far is equal to pi; on leap years the 25th July 22 (22/7 in the majority of date formats, an ancient approximation of pi)
November 10 (the 314th day of the year; on leap years the 9th)
December 21, 1:13 p.m. (the 355th day of the year (on leap years, the 20th), celebrated at 1:13 for the Chinese approximation 355/113
Works for me! Any excuse for a day off!
Mar 14, 2007
Take The Day Off - It's a Holiday!
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