March 14th is Pi Day. Did you know that the first large-scale observance of Pi Day happened in 1988? Here’s some background information for those of us just getting into the celebration! Via Wikipedia
Pi Day is an annual celebration of the mathematical constant π (pi) in the US. Pi Day is observed on March 14 (3/14 in the month/day date format) since 3, 1, and 4 are the first three significant digits of π. In 2009, the United States House of Representatives supported the designation of Pi Day.
Pi Approximation Day is observed on July 22 (22/7 in the day/month date format), since the fraction 22⁄7 is a common approximation of π, which is accurate to two decimal places and dates from Archimedes.
The earliest known official or large-scale celebration of Pi Day was organized by Larry Shaw in 1988 at the San Francisco Exploratorium, where Shaw worked as a physicist, with staff and public marching around one of its circular spaces, then consuming fruit pies. The Exploratorium continues to hold Pi Day celebrations.
On March 12, 2009, the U.S. House of Representatives passed a non-binding resolution (HRES 224), recognizing March 14, 2009 as National Pi Day. For Pi Day 2010, Google presented a Google Doodle celebrating the holiday, with the word Google laid over images of circles and pi symbols.
The entire month of March 2014 (3/14) was observed by some as Pi Month. In the year 2015, Pi Day had special significance on 3/14/15 (mm/dd/yy date format) at 9:26:53 a.m. and also at p.m., with the date and time representing the first 10 digits of π. That same second also contained a precise instant corresponding to all of the digits of π. March 14, 2016 was called Engineer’s Pi Day or Practical Pi Day, as 3.1416 is the most accurate approximation of pi in five decimal digits.
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