Title: Pi Day
Content:  Pi Day is an annual celebration of the mathematical constant (pi). Pi Day is observed on March 14 (3/14 in the month/day format) since 3, 1, and 4 are the first three significant digits of. It was founded in 1988 by Larry Shaw, an employee of the Exploratorium. Celebrations often involve eating pie or holding pi recitation competitions. In 2009, the United States House of Representatives supported the designation of Pi Day. UNESCO's 40th General Conference designated Pi Day as the International Day of Mathematics in November 2019. Alternative dates for the holiday include July 22 (22/7, an approximation of ) and June 28 (6.28, an approximation of 2 or tau).
Title: Pi Day
Content:  In 1988, the earliest known official or large-scale celebration of Pi Day was organized by Larry Shaw 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 (111 H. Res. 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; and for the 30th anniversary in 2018, it was a Dominique Ansel pie with the circumference divided by its diameter. The entire month of March 2014 (3/14) was observed by some as "Pi Month". In the year 2015, March 14 was celebrated as "Super Pi Day". It had special significance, as the date is written as 3/14/15 in month/day/year format. At 9:26:53, the date and time together represented the first 10 digits of, and later that second Pi Instant represented all of 's digits.
Title: Pi Day
Content:  year's "pi minute", and in 2020, regular decisions were released at 1:59 pm, making the first six digits of pi. June 28 is "Two Pi Day", also known as "Tau Day". 2, also known by the Greek letter tau is a common multiple in mathematical formulae. Some have argued that τ is the more fundamental constant, and that Tau Day should be celebrated instead. Celebrations of this date jokingly suggest eating "twice the pie". Princeton, New Jersey, hosts numerous events in a combined celebration of Pi Day and Albert Einstein's birthday, which is also March 14. Einstein lived in Princeton for more than twenty years while working at the Institute for Advanced Study. In addition to pie eating and recitation contests, there is an annual Einstein look-alike contest.
Title: Pi
Content:  is a transcendental figure without resolution". In the United States, Pi Day falls on 14 March (written 3/14 in the US style), and is popular among students. and its digital representation are often used by self-described "math geeks" for inside jokes among mathematically and technologically minded groups. Several college cheers at the Massachusetts Institute of Technology include "3.14159". Pi Day in 2015 was particularly significant because the date and time 3/14/15 9:26:53 reflected many more digits of pi. In parts of the world where dates are commonly noted in day/month/year format, 22 July represents "Pi Approximation Day," as 22/7 = 3.142857. During the 2011 auction for Nortel's portfolio of 
Title: Larry Shaw (Pi)
Content:  digit of pi, a pi shrine, eating of pies (fruit and pizza), singing happy birthday to Albert Einstein, and more. Larry Shaw would lead the parade in his red cap with the digits of pi. Pi Day was recognized as a national holiday in 2009 and is internationally celebrated. Also, 2015 was a special year with it being written 3/14/15, calling it "Pi Day of the Century". Shaw felt the best thing about Pi Day was making math more accessible, fun for those who may have had problems in school. When asked if he was proud with events being held around the world, "Yes and no. It's not mine; it's everybody's. I'm just the guy holding the pole."
Title: Pi Day
Content:  Pi Day has been observed in many ways, including eating pie, throwing pies and discussing the significance of the number, due to a pun based on the words "pi" and "pie" being homophones in English , and the coincidental circular shape of many pies. Also, some schools hold competitions as to which student can recall pi to the highest number of decimal places. Massachusetts Institute of Technology has often mailed its application decision letters to prospective students for delivery on Pi Day. Starting in 2012, MIT has announced it will post those decisions (privately) online on Pi Day at exactly 6:28 pm, which they have called "Tau Time", to honor the rival numbers pi and tau equally. In 2015, the regular decisions were put online at 9:26 am, following 
Title: Pi Day
Content:  Pi Day is most frequently observed on March 14, but related celebrations have been held on alternative dates. Pi Approximation Day is observed on July 22 (22/7 in the day/month format), since the fraction 22⁄7 is a common approximation of, which is accurate to two decimal places and dates from Archimedes. Two Pi Day, also known as Tau Day for the mathematical constant Tau, which is approximated as 6.28, is observed on June 28 (6/28 in the month/day format). Pi Approximation Day is also observed on the 10th of November since it is the 314th day of the year.
Title: Larry Shaw (Pi)
Content:  Larry Shaw, the "Prince of Pi", invented the holiday Pi Day in 1988 while at the Exploratorium. During an off-site staff retreat in 1988, he started talking with his co-workers, like Ron Hipschman, about the mysteries of mathematical constants. Shaw came up with the idea to link pi (3.14159…), which begins with 3.14, with the date 3/14 or March 14. Co-workers built on the idea and they had a mini-celebration with just the staff, starting with eating of pies. The next year, the holiday was held for all at the museum and every year since, even when the museum was closed during its move. The celebration includes a parade at 1:59 p.m. with visitors holding a sign with 
Title: International Day of Mathematics
Content:  The International Day of Mathematics is 14 March. It is also known as the Pi Day, because the mathematical constant (pi) can be rounded up to 3.14. UNESCO's 40th General Conference decided Pi Day as the International Day of Mathematics in November 2019.
Title: Albert Einstein in popular culture
Content:  In 1999, leading physicists voted Einstein the "greatest physicist ever". His birthday, March 14, is also Pi Day, so called because 3/14 (March 14 in shorthand month-day format) corresponds to 3.14, the first three digits of the number Pi. The town of Princeton, New Jersey, where Einstein lived for more than 20 years, celebrates March 14 every year as "Princeton Pi Day and Einstein Birthday Party."

Question: how long have we been celebrating pi day?
Answer: 1988.
2009.