Pi Day

The Pi Day (English Pi Day ) is an unofficial holiday, which will be held in honor of the mathematical constant Pi.

It takes place every year on the 14th of March and goes back to the U.S. date notation 3-14 or 3/14 (3.14 is the numerical value of π rounded to two decimal places ). Especially exact trailer of this day celebrate by 1 clock 59 and 26 seconds and reach the circuit number in order to the seventh decimal place, 3.1415926. As the founder of this tradition applies Larry Shaw, Pi ​​Day 1988 at the Exploratorium initiated in San Francisco, where he is celebrated annually ever since. 2009 March 14 by the U.S. Congress was declared the official National Day for the circle constant pi in the United States.

The Pi Day is traditionally celebrated with the common eating of round cake ( in English the Greek letter π is according to the same as the English word pie, cake ' as " Pai " pronounced).

Secondly, a Pi - Annäherungstag (Pi Approximation Day) is celebrated on 22 July, with the approximate representation of π by Archimedes as a 22/7 ≈ 3.14 is to be honored.