Pi Day is observed on March 14 because of the date’s representation as 3/14 inÂ month/day date format. This representation adheres to the commonly used approximation of 3.14 for Ï€.
Larry Shaw created Pi Day in 1989.The holiday was celebrated at theÂ San Francisco Exploratorium, where Shaw worked as aÂ physicist,Â with staff and public marching around one of its circular spaces, then consuming fruit pies.The Exploratorium continues to hold Pi Day celebrations.
On Pi Day 2004,Â Daniel Tammet recited 22,514 decimal digits of Ï€.
On March 12, 2009, the U.S. House of Representatives passed aÂ non-binding resolution (HRES 224),Â recognizing March 14, 2009, as National Pi Day.
In 2015, Pi Day will reflect five digits of Ï€ (3.1415) as 3/14/15 inÂ month/day/year date format.