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| holiday_name  = Pi Day
| holiday_name  = Pi Day
| image        = Larry Shaw, the founder of Pi Day, at the Exploratorium in San Francisco--2007 March 21.jpg
| 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]]
| caption      = [[Larry Shaw (physicist)|Larry Shaw]], the organizer of the first Pi Day celebration, at the [[Exploratorium]] in [[San Francisco]]
| observedby    = United States
| observedby    = United States
| significance  = 3, 1, and 4 are the three most [[significant figure]]s of {{pi}} in its decimal representation.
| significance  = 3, 1, and 4 are the three most [[significant figure]]s of {{pi}} in its decimal representation.
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}}
}}
{{Pi box}}
{{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>
'''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 (physicist)|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).
Other dates when people celebrate pi include Pi Approximation Day on July 22 (22/7 in the ''day/month'' format), a closer [[Approximations of π|approximation of {{pi}}]]; and June 28 (6.28), an approximation of 2{{pi}} or [[Tau (mathematical constant)|{{tau}}]] (tau).


== History ==
== History ==
In 1988, the earliest known official or large-scale celebration of Pi Day was organized by [[Larry Shaw (Pi)|Larry Shaw]] at the [[Exploratorium|San Francisco Exploratorium]],<ref>{{Cite web |last=Berton |first=Justin |date=March 11, 2009 |title=Any way you slice it, pi's transcendental |url=https://www.sfgate.com/science/article/Any-way-you-slice-it-pi-s-transcendental-3169091.php |access-date=March 18, 2011 |website=[[San Francisco Chronicle]]}}</ref> where Shaw worked as a [[physicist]],<ref name="ABC – Science – 10 Mar 2011 – infinite appeal of pi">{{Cite web |last=Borwein |first=Jonathan |author-link=Jonathan Borwein |date=March 10, 2011 |title=The infinite appeal of pi |url=http://www.abc.net.au/science/articles/2011/03/10/3158045.htm?site=science/opinion |access-date=March 13, 2011 |publisher=[[Australian Broadcasting Corporation]]}}</ref> with staff and public marching around one of its circular spaces, then consuming fruit pies.<ref name="fresnobee">{{Cite news |last=Apollo |first=Adrian |date=March 10, 2007 |title=A place where learning pi is a piece of cake |work=[[The Fresno Bee]] |url=http://apollotutoring.com/pi_day.pdf}}</ref> The Exploratorium continues to hold Pi Day celebrations.<ref name="exploratorium">{{Cite web |title=Exploratorium 22nd Annual Pi Day |url=http://www.exploratorium.edu/pi/index.html |url-status=dead |archive-url=https://web.archive.org/web/20110314012746/http://www.exploratorium.edu/pi/index.html |archive-date=March 14, 2011 |access-date=January 31, 2011 |publisher=Exploratorium}}</ref>
In 1988, the earliest known official or large-scale celebration of Pi Day was organized by [[Larry Shaw (physicist)|Larry Shaw]] at the [[Exploratorium|San Francisco Exploratorium]],<ref>{{Cite web |last=Berton |first=Justin |date=March 11, 2009 |title=Any way you slice it, pi's transcendental |url=https://www.sfgate.com/science/article/Any-way-you-slice-it-pi-s-transcendental-3169091.php |access-date=March 18, 2011 |website=[[San Francisco Chronicle]]}}</ref> where Shaw worked as a [[physicist]],<ref name="ABC – Science – 10 Mar 2011 – infinite appeal of pi">{{Cite web |last=Borwein |first=Jonathan |author-link=Jonathan Borwein |date=March 10, 2011 |title=The infinite appeal of pi |url=http://www.abc.net.au/science/articles/2011/03/10/3158045.htm?site=science/opinion |access-date=March 13, 2011 |publisher=[[Australian Broadcasting Corporation]]}}</ref> with staff and public marching around one of its circular spaces, then consuming fruit pies.<ref name="fresnobee">{{Cite news |last=Apollo |first=Adrian |date=March 10, 2007 |title=A place where learning pi is a piece of cake |work=[[The Fresno Bee]] |url=http://apollotutoring.com/pi_day.pdf}}</ref> The Exploratorium continues to hold Pi Day celebrations.<ref name="exploratorium">{{Cite web |title=Exploratorium 22nd Annual Pi Day |url=http://www.exploratorium.edu/pi/index.html |url-status=dead |archive-url=https://web.archive.org/web/20110314012746/http://www.exploratorium.edu/pi/index.html |archive-date=March 14, 2011 |access-date=January 31, 2011 |publisher=Exploratorium}}</ref>


On March 12, 2009, the U.S. House of Representatives passed a [[non-binding resolution]] ([[wikisource:H. RES. 224 Supporting the designation of Pi Day, and for other purposes|111 H. Res. 224]]),<ref name="HORRes" /> recognizing March 14, 2009, as National Pi Day.<ref>{{Cite news |last=McCullagh |first=Declan |date=March 11, 2009 |title=National Pi Day? Congress makes it official |work=Politics and Law |publisher=[[CNET News]] |url=http://news.cnet.com/8301-13578_3-10194354-38.html?part=rss&subj=news&tag=2547-1_3-0-5 |access-date=March 14, 2009}}</ref> For Pi Day 2010, Google presented a [[Google Doodle]] celebrating the holiday, with the word Google laid over images of circles and pi symbols;<ref name="GoogleDoodle">{{Cite web |title=Pi Day |url=https://doodles.google/doodle/pi-day/ |access-date=October 9, 2012 |website=Google Doodles}}</ref> and for the 30th anniversary in 2018, it was a [[Dominique Ansel]] pie with the [[circumference]] divided by its [[diameter]].<ref>{{Cite web |title=30th Anniversary of Pi Day! |url=https://doodles.google/doodle/30th-anniversary-of-pi-day/ |access-date=March 19, 2018 |website=www.google.com |language=en}}</ref>
On March 12, 2009, the U.S. House of Representatives passed a [[non-binding resolution]] ([[wikisource:H. RES. 224 Supporting the designation of Pi Day, and for other purposes|111 H. Res. 224]]),<ref name="HORRes" /> recognizing March 14, 2009, as National Pi Day.<ref>{{Cite news |last=McCullagh |first=Declan |date=March 11, 2009 |title=National Pi Day? Congress makes it official |work=Politics and Law |publisher=[[CNET News]] |url=http://news.cnet.com/8301-13578_3-10194354-38.html?part=rss&subj=news&tag=2547-1_3-0-5 |access-date=March 14, 2009}}</ref> For Pi Day 2010, Google presented a [[Google Doodle]] celebrating the holiday, with the word Google laid over images of circles and pi symbols;<ref name="GoogleDoodle">{{Cite web |title=Pi Day |url=https://doodles.google/doodle/pi-day/ |access-date=October 9, 2012 |website=Google Doodles}}</ref> and for the 30th anniversary in 2018, it was a [[Dominique Ansel]] pie with the [[circumference]] divided by its [[diameter]].<ref>{{Cite web |title=30th Anniversary of Pi Day! |url=https://doodles.google/doodle/30th-anniversary-of-pi-day/ |access-date=March 19, 2018 |website=www.google.com |language=en}}</ref>
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Pi Day is frequently observed on March 14 (3/14 in the ''month/day'' date format), but related celebrations have been held on alternative dates.
Pi Day is frequently observed on March 14 (3/14 in the ''month/day'' date format), but related celebrations have been held on alternative dates.


'''Pi Approximation Day''' is observed on July 22 (22/7 in the ''day/month'' date format), since the [[Fraction (mathematics)|fraction]] {{frac|22|7}} is a common [[Approximations of π|approximation of {{pi}}]], which is accurate to two decimal places and dates from [[Archimedes]].<ref name="VerizonTodayInHistory">{{Cite web |title=Pi Approximation Day is celebrated today |url=http://www.thinkfinity.org/2010-07-22_pi-approximation-day |archive-url=https://web.archive.org/web/20101201010400/http://www.thinkfinity.org/2010-07-22_pi-approximation-day |archive-date=December 1, 2010 |access-date=January 30, 2011 |website=Today in History |publisher=Verizon Foundation}}</ref> In Indonesia, [[Date and time representation by country|a country that uses the DD/MM/YYYY date format]], some people celebrate Pi Day every July 22.<ref>{{Cite book |last=Purworini |first=D. |title=Pi Day celebration by local scientists in Indonesia |year=2016 |volume=7 |location=Anak Sudarti Foundation Bulletin |pages=7–8}}</ref>
'''Pi Approximation Day''' is observed on [[July 22]] (22/7 in the ''day/month'' date format), since the [[Fraction (mathematics)|fraction]] {{frac|22|7}} is a common [[Approximations of π|approximation of {{pi}}]], which is accurate to two decimal places and dates from [[Archimedes]].<ref name="VerizonTodayInHistory">{{Cite web |title=Pi Approximation Day is celebrated today |url=http://www.thinkfinity.org/2010-07-22_pi-approximation-day |archive-url=https://web.archive.org/web/20101201010400/http://www.thinkfinity.org/2010-07-22_pi-approximation-day |archive-date=December 1, 2010 |access-date=January 30, 2011 |website=Today in History |publisher=Verizon Foundation}}</ref> In Indonesia, [[Date and time representation by country|a country that uses the DD/MM/YYYY date format]], some people celebrate Pi Day every July 22.<ref>{{Cite book |last=Purworini |first=D. |title=Pi Day celebration by local scientists in Indonesia |year=2016 |volume=7 |location=Anak Sudarti Foundation Bulletin |pages=7–8}}</ref>


'''[[Tau (mathematical constant)|Tau]] Day''', also known as '''Two-Pi Day''',<ref>{{Cite web |url=https://newsroom.lamresearch.com/Celebrating-Pi-Day-2017-and-More |title=Celebrating Pi Day 2017… and More! |first=Elizabeth |last=Pavel |date=March 13, 2017 |publisher=[[Lam Research]] |access-date=6 November 2024 |archive-url=https://web.archive.org/web/20230330164730/http://newsroom.lamresearch.com/Celebrating-Pi-Day-2017-and-More |archive-date=March 30, 2023 |url-status=live}}</ref> is observed on June 28 (6/28 in the ''month/day'' format).<ref name="lightyears">{{Cite web |title=Tau Day: Why you should eat twice the pie |url=https://lightyears.blogs.cnn.com/2012/06/28/tau-day-why-you-should-eat-twice-the-pie/ |url-status=dead |archive-url=https://web.archive.org/web/20130112211136/http://lightyears.blogs.cnn.com/2012/06/28/tau-day-why-you-should-eat-twice-the-pie/ |archive-date=January 12, 2013}}</ref> The number [[Turn (angle)#Tau proposals|{{tau}}]], denoted by the Greek letter [[tau]], is the ratio of a circle's [[circumference]] to its [[radius]]; it equals 2{{pi}}, a common multiple in mathematical formulae, and approximately equals 6.28. Some have argued that {{tau}} is the clearer and more fundamental constant and that Tau Day should be celebrated alongside or instead of Pi Day.<ref>{{Cite news |date=March 13, 2018 |title=It's Pi Day today. But these people say we should refuse to celebrate it |language=en-GB |work=The Independent |url=https://www.independent.co.uk/news/science/pi-day-march-14-maths-google-doodle-pie-baking-celebrate-30-anniversary-a8254036.html |url-status=live |url-access=subscription |access-date=March 14, 2018 |archive-url=https://ghostarchive.org/archive/20220526/https://www.independent.co.uk/news/science/pi-day-march-14-maths-google-doodle-pie-baking-celebrate-30-anniversary-a8254036.html |archive-date=May 26, 2022}}</ref><ref>{{Cite news |date=March 14, 2013 |title=Pi Day Turns 25: Why We Celebrate an Irrational Number |url=https://news.nationalgeographic.com/news/2013/03/031314-pi-day-exploratorium-mathematics-pie-science/ |archive-url=https://web.archive.org/web/20130314185319/http://news.nationalgeographic.com/news/2013/03/031314-pi-day-exploratorium-mathematics-pie-science/ |url-status=dead |archive-date=March 14, 2013 |access-date=March 14, 2018}}</ref><ref>{{Cite web |last=BMJ |date=June 22, 2018 |title=Jeffrey Aronson: When I use a word ... The Days of Pi |url=https://blogs.bmj.com/bmj/2018/06/22/jeffrey-aronson-when-i-use-a-word-the-days-of-pi/ |access-date=May 2, 2023 |website=The BMJ |language=en-US}}</ref> Celebrants of this date jokingly suggest eating "twice the pie".<ref>{{Cite book |last=Bartholomew |first=Randyn Charles |url=https://www.scientificamerican.com/article/let-s-use-tau-it-s-easier-than-pi/ |title=Why Tau Trumps Pi |language=en}}</ref><ref>{{Cite news |last=Landau |first=Elizabeth |title=In case Pi Day wasn't enough, it's now 'Tau Day' on the Internet |language=en |work=CNN |url=http://www.cnn.com/2011/TECH/innovation/06/28/tau.day.math/index.html}}</ref><ref>{{Cite web |title=Tau Day – Come Eat Twice the (Pi)e |url=https://www.geocaching.com/geocache/GC56WHN_tau-day-come-eat-twice-the-pie?guid=19c50aa3-fe1c-4961-8df8-f03f3798de91 |language=en}}</ref>
'''[[Tau (mathematical constant)|Tau]] Day''', also known as '''Two-Pi Day''',<ref>{{Cite web |url=https://newsroom.lamresearch.com/Celebrating-Pi-Day-2017-and-More |title=Celebrating Pi Day 2017… and More! |first=Elizabeth |last=Pavel |date=March 13, 2017 |publisher=[[Lam Research]] |access-date=6 November 2024 |archive-url=https://web.archive.org/web/20230330164730/http://newsroom.lamresearch.com/Celebrating-Pi-Day-2017-and-More |archive-date=March 30, 2023 |url-status=live}}</ref> is observed on [[June 28]] (6/28 in the ''month/day'' format).<ref name="lightyears">{{Cite web |title=Tau Day: Why you should eat twice the pie |url=https://lightyears.blogs.cnn.com/2012/06/28/tau-day-why-you-should-eat-twice-the-pie/ |url-status=dead |archive-url=https://web.archive.org/web/20130112211136/http://lightyears.blogs.cnn.com/2012/06/28/tau-day-why-you-should-eat-twice-the-pie/ |archive-date=January 12, 2013}}</ref> The number [[Turn (angle)#Tau proposals|{{tau}}]], denoted by the Greek letter [[tau]], is the ratio of a circle's [[circumference]] to its [[radius]]; it equals 2{{pi}}, a common multiple in mathematical formulae, and approximately equals 6.28. Some have argued that {{tau}} is the clearer and more fundamental constant and that Tau Day should be celebrated alongside or instead of Pi Day.<ref>{{Cite news |date=March 13, 2018 |title=It's Pi Day today. But these people say we should refuse to celebrate it |language=en-GB |work=The Independent |url=https://www.independent.co.uk/news/science/pi-day-march-14-maths-google-doodle-pie-baking-celebrate-30-anniversary-a8254036.html |url-status=live |url-access=subscription |access-date=March 14, 2018 |archive-url=https://ghostarchive.org/archive/20220526/https://www.independent.co.uk/news/science/pi-day-march-14-maths-google-doodle-pie-baking-celebrate-30-anniversary-a8254036.html |archive-date=May 26, 2022}}</ref><ref>{{Cite news |date=March 14, 2013 |title=Pi Day Turns 25: Why We Celebrate an Irrational Number |url=https://news.nationalgeographic.com/news/2013/03/031314-pi-day-exploratorium-mathematics-pie-science/ |archive-url=https://web.archive.org/web/20130314185319/http://news.nationalgeographic.com/news/2013/03/031314-pi-day-exploratorium-mathematics-pie-science/ |url-status=dead |archive-date=March 14, 2013 |access-date=March 14, 2018}}</ref><ref>{{Cite web |last=BMJ |date=June 22, 2018 |title=Jeffrey Aronson: When I use a word ... The Days of Pi |url=https://blogs.bmj.com/bmj/2018/06/22/jeffrey-aronson-when-i-use-a-word-the-days-of-pi/ |access-date=May 2, 2023 |website=The BMJ |language=en-US}}</ref> Celebrants of this date jokingly suggest eating "twice the pie".<ref>{{Cite book |last=Bartholomew |first=Randyn Charles |url=https://www.scientificamerican.com/article/let-s-use-tau-it-s-easier-than-pi/ |title=Why Tau Trumps Pi |language=en}}</ref><ref>{{Cite news |last=Landau |first=Elizabeth |title=In case Pi Day wasn't enough, it's now 'Tau Day' on the Internet |language=en |work=CNN |url=http://www.cnn.com/2011/TECH/innovation/06/28/tau.day.math/index.html}}</ref><ref>{{Cite web |title=Tau Day – Come Eat Twice the (Pi)e |url=https://www.geocaching.com/geocache/GC56WHN_tau-day-come-eat-twice-the-pie?guid=19c50aa3-fe1c-4961-8df8-f03f3798de91 |language=en}}</ref>


Some also celebrate {{pi}} on November 10, since it is the 314th day of the year (in leap years, on November 9).<ref>{{Cite web |title=Pi Day – Fun Holiday |url=https://www.timeanddate.com/holidays/fun/pi-day |access-date=March 13, 2022 |publisher=Timeanddate.com}}</ref>
Some also celebrate {{pi}} on [[November 10]], since it is the 314th day of the year (in leap years, on [[November 9]]).<ref>{{Cite web |title=Pi Day – Fun Holiday |url=https://www.timeanddate.com/holidays/fun/pi-day |access-date=March 13, 2022 |publisher=Timeanddate.com}}</ref>


==Gallery==
==Gallery==

Latest revision as of 22:39, 27 July 2025

Template:Short description Script error: No such module "Distinguish". Template:Use American English Template:Use mdy dates Script error: No such module "Infobox".Template:Template otherTemplate:Main otherScript error: No such module "Check for unknown parameters". Template:Pi box Pi Day is an annual celebration of the mathematical constant [[pi|Template:Pi (pi)]]. Pi Day is observed on March 14 (the 3rd month) since 3, 1, and 4 are the first three significant figures of Template:Pi, and was first celebrated in the United States.[1][2] It was founded in 1988 by Larry Shaw, an employee of a science museum in San Francisco, 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.[3] UNESCO's 40th General Conference designated Pi Day as the International Day of Mathematics in November 2019.[4][5]

Other dates when people celebrate pi include Pi Approximation Day on July 22 (22/7 in the day/month format), a closer [[Approximations of π|approximation of Template:Pi]]; and June 28 (6.28), an approximation of 2Template:Pi or [[Tau (mathematical constant)|Template:Tau]] (tau).

History

In 1988, the earliest known official or large-scale celebration of Pi Day was organized by Larry Shaw at the San Francisco Exploratorium,[6] where Shaw worked as a physicist,[7] with staff and public marching around one of its circular spaces, then consuming fruit pies.[8] The Exploratorium continues to hold Pi Day celebrations.[9]

On March 12, 2009, the U.S. House of Representatives passed a non-binding resolution (111 H. Res. 224),[3] recognizing March 14, 2009, as National Pi Day.[10] For Pi Day 2010, Google presented a Google Doodle celebrating the holiday, with the word Google laid over images of circles and pi symbols;[11] and for the 30th anniversary in 2018, it was a Dominique Ansel pie with the circumference divided by its diameter.[12]

Some observed the entire month of March 2014 (3/14) as "Pi Month".[13][14] In the year 2015, March 14 was celebrated as "Super Pi Day".[15] 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 ten digits of Template:Pi,[16] and later that second, "Pi Instant" represented all of Template:Pi's digits.[17]

Observance

File:Happy Pi Day sign for sales on pies at Delicious Orchards.jpg
Pi Day related offering at Delicious Orchards, a country food market in Colts Neck, New Jersey

Pi Day has been observed in many ways, including eating pie, throwing pies and discussing the significance of the number Template:Pi.[18] The first two are due to a pun based on the words "pi" and "pie" being homophones in English (Template:IPAc-en), and the coincidental circular shape of many pies.[19][20] Many pizza and pie restaurants offer discounts, deals, and free products on Pi Day.[21] Also, some schools hold competitions as to which student can recall pi to the highest number of decimal places.[22][23]

The Massachusetts Institute of Technology has often mailed its application decision letters to prospective students for delivery on Pi Day.[24] 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 Template:Pi and Template:Tau equally.[25][26] In 2015, the regular decisions were put online at 9:26 am, following that year's "pi minute",[27] and in 2020, regular decisions were released at 1:59 pm, making the first six digits of pi.[28]

Princeton, New Jersey, hosts numerous events in a combined celebration of Pi Day and Albert Einstein's birthday, which is also March 14.[29] 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.[29]

In 2024, the recreational mathematician Matt Parker and a team of hundreds of volunteers at City of London School spent six days calculating 139 correct digits of pi by hand, in what Parker claimed was "the biggest hand calculation in a century".[30][31] On 15 August 2024, the main-belt asteroid 314159 MattparkerTemplate:Efn was named in his honor. The citation highlights Parker's biennial "Pi Day challenges", stating that they have helped to popularize mathematics.[32][33]

Alternative dates

Pi Day is frequently observed on March 14 (3/14 in the month/day date format), but related celebrations have been held on alternative dates.

Pi Approximation Day is observed on July 22 (22/7 in the day/month date format), since the fraction <templatestyles src="Fraction/styles.css" />22⁄7 is a common [[Approximations of π|approximation of Template:Pi]], which is accurate to two decimal places and dates from Archimedes.[34] In Indonesia, a country that uses the DD/MM/YYYY date format, some people celebrate Pi Day every July 22.[35]

Tau Day, also known as Two-Pi Day,[36] is observed on June 28 (6/28 in the month/day format).[37] The number [[Turn (angle)#Tau proposals|Template:Tau]], denoted by the Greek letter tau, is the ratio of a circle's circumference to its radius; it equals 2Template:Pi, a common multiple in mathematical formulae, and approximately equals 6.28. Some have argued that Template:Tau is the clearer and more fundamental constant and that Tau Day should be celebrated alongside or instead of Pi Day.[38][39][40] Celebrants of this date jokingly suggest eating "twice the pie".[41][42][43]

Some also celebrate Template:Pi on November 10, since it is the 314th day of the year (in leap years, on November 9).[44]

Gallery

See also

Notes

Template:Notelist

References

Template:Reflist

External links

Template:Sister project Template:Sister project

Template:Science commemorative events Template:Authority control

  1. ↑ Script error: No such module "citation/CS1".
  2. ↑ Script error: No such module "citation/CS1".
  3. ↑ a b United States. Cong. House. Supporting the designation of Pi Day, and for other purposes. 111th Cong. Library of Congress Template:Webarchive
  4. ↑ Script error: No such module "citation/CS1".
  5. ↑ Script error: No such module "Citation/CS1".
  6. ↑ Script error: No such module "citation/CS1".
  7. ↑ Script error: No such module "citation/CS1".
  8. ↑ Script error: No such module "citation/CS1".
  9. ↑ Script error: No such module "citation/CS1".
  10. ↑ Script error: No such module "citation/CS1".
  11. ↑ Script error: No such module "citation/CS1".
  12. ↑ Script error: No such module "citation/CS1".
  13. ↑ Template:Cite magazine
  14. ↑ Script error: No such module "citation/CS1".
  15. ↑ Script error: No such module "citation/CS1".
  16. ↑ Script error: No such module "citation/CS1".
  17. ↑ Script error: No such module "Citation/CS1".
  18. ↑ Script error: No such module "citation/CS1".
  19. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named landau
  20. ↑ Script error: No such module "citation/CS1".
  21. ↑ Script error: No such module "citation/CS1".
  22. ↑ Script error: No such module "citation/CS1".
  23. ↑ Script error: No such module "citation/CS1".
  24. ↑ Script error: No such module "citation/CS1".
  25. ↑ Script error: No such module "citation/CS1".
  26. ↑ Script error: No such module "citation/CS1".
  27. ↑ Script error: No such module "citation/CS1".
  28. ↑ Script error: No such module "citation/CS1".
  29. ↑ a b Script error: No such module "citation/CS1".
  30. ↑ Script error: No such module "Citation/CS1".
  31. ↑ Script error: No such module "citation/CS1".
  32. ↑ Script error: No such module "Citation/CS1".
  33. ↑ Script error: No such module "citation/CS1".
  34. ↑ Script error: No such module "citation/CS1".
  35. ↑ Script error: No such module "citation/CS1".
  36. ↑ Script error: No such module "citation/CS1".
  37. ↑ Script error: No such module "citation/CS1".
  38. ↑ Script error: No such module "citation/CS1".
  39. ↑ Script error: No such module "citation/CS1".
  40. ↑ Script error: No such module "citation/CS1".
  41. ↑ Script error: No such module "citation/CS1".
  42. ↑ Script error: No such module "citation/CS1".
  43. ↑ Script error: No such module "citation/CS1".
  44. ↑ Script error: No such module "citation/CS1".
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