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Pi Day
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{{Short description|Annual mathematical celebration on March 14}} {{Distinguish|National Pie Day}} {{Use American English|date=July 2022}} {{Use mdy dates|date=March 2024}} {{Infobox holiday | holiday_name = Pi Day | image = Larry Shaw, the founder of Pi Day, at the Exploratorium in San Francisco--2007 March 21.jpg | caption = [[Larry Shaw (Pi)|Larry Shaw]], the organizer of the first Pi Day celebration, at the [[Exploratorium]] in [[San Francisco]] | observedby = United States | significance = 3, 1, and 4 are the three most [[significant figure]]s of {{pi}} in its decimal representation. | duration = 1 day | frequency = Annual | scheduling = same day each year | date = March 14 | mdy = y | firsttime = 1988 | celebrations = [[Pie]] eating, [[pi memorization]] competitions, discussions about {{pi}}<ref name="landau">{{Cite news |last=Landau |first=Elizabeth |author-link=Elizabeth Landau |date=March 12, 2010 |title=On Pi Day, one number 'reeks of mystery' |language=en |publisher=CNN |url=http://www.cnn.com/2010/TECH/03/12/pi.day.math/index.html |access-date=March 14, 2018}}</ref> | relatedto = Pi Approximation Day | type = default | longtype = Mathematical }} {{Pi box}} '''Pi Day''' is an [[list of minor secular observances#March|annual celebration]] of the [[mathematical constant]] [[pi|{{pi}} (pi)]]. Pi Day is observed on [[March 14]] (the 3rd month) since 3, 1, and 4 are the first three [[significant figures]] of {{pi}}, and was first celebrated in the United States.<ref>{{Cite web |last=Bellos |first=Alex |date=March 14, 2015 |title=Pi Day 2015: a sweet treat for maths fans |url=https://www.theguardian.com/science/2015/mar/13/pi-day-celebration-maths-fans-language-memory-contests |access-date=March 14, 2016 |website=[[The Guardian]]}}</ref><ref>{{Cite web |date=March 14, 2015 |title=Nedräkning mot internationella Pi-dagen |language=sv |url=http://sverigesradio.se/sida/avsnitt/514543?programid=412 |website=Swedish national radio company}}</ref> It was founded in 1988 by [[Larry Shaw (Pi)|Larry Shaw]], an employee of a [[science museum]] in [[San Francisco]], the [[Exploratorium]]. Celebrations often involve eating [[pie]] or holding [[Piphilology|pi recitation]] competitions. In 2009, the [[United States House of Representatives]] supported the designation of Pi Day.<ref name="HORRes">United States. Cong. House. Supporting the designation of Pi Day, and for other purposes. 111th Cong. [http://thomas.loc.gov/cgi-bin/query/z?c111:H.RES.224: Library of Congress] {{Webarchive|url=https://web.archive.org/web/20090807131531/http://thomas.loc.gov/cgi-bin/query/z?c111:H.RES.224: |date=August 7, 2009 }}</ref> [[UNESCO]]'s 40th General Conference designated Pi Day as the International Day of Mathematics in November 2019.<ref>{{Cite web |date=March 4, 2020 |title=International Day of Mathematics |url=https://en.unesco.org/commemorations/mathematics |website=UNESCO |language=en}}</ref><ref>{{Cite journal |last=Rousseau |first=Christiane |url=https://www.ams.org/journals/notices/201908/rnoti-p1306.pdf |title=International Day of Mathematics |date=September 1, 2019 |journal=Notices of the American Mathematical Society |volume=66 |page=1 |doi=10.1090/noti1928 |doi-access=free |issue=8}}</ref> Other dates when people celebrate pi include Pi Approximation Day on July 22 (22/7 in the ''day/month'' format), another [[Approximations of π|approximation of {{pi}}]]; and June 28 (6.28), an approximation of 2{{pi}} or [[Tau (mathematical constant)|{{tau}}]] (tau).
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