Pi Day History
Pi Day celebrates the mathematical constant π (pi), 3.141592653... Pi is the ratio between the circumference (the distance around the circle) and diameter (the distance of a straight line that goes through the center of a circle). Pi is a constant, therefore it will be the same for circles of all sizes. Pi is a special number due to its infinite and pattern-less nature, meaning that the digits after the decimal point never repeat themselves in a specific pattern.
Pi Day celebrations originated in 1988 at the San Francisco Exploratorium when Larry Shaw, a physicist at the Exploratorium, organized the first Pi Day. It was held on March 14th (3/14), given that the first digits of Pi are 3.14. Celebrations at the Exploratorium included taking young museum visitors on a parade to the Pi Shrine, which is a round brass plaque fixed on the floor of the museum and serving fruit pies to visitors. Since then, Pi Day celebrations have spread both nationally and globally. On March 12, 2009, the U.S. House of Representatives recognized March 14 as National Pi Day.
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Pi Day References and Related Siteswww.guinnessworldrecords.com: Most Pi Places Memorized Library of Congress: Pi Day