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Pi Day

January 01, 1970

Not to be confused with National Pie Day.

Pi Day is an annual celebration of the mathematical constant π (pi). Pi Day is observed on March 14 (the 3rd month) since 3, 1, and 4 are the first three significant figures of π, and it was first celebrated in the United States.[2][3] It was founded in 1988 by Larry Shaw, an employee of the San Francisco science museum, 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.[4] UNESCO's 40th General Conference designated Pi Day as the International Day of Mathematics in November 2019.[5][6]

Pi Day
Larry Shaw, the organizer of the first Pi Day celebration at the Exploratorium in San Francisco
Observed byUnited States
TypeMathematical
Significance3, 1, and 4 are the three most significant figures of π in its decimal representation.
CelebrationsPie eating, pi memorization competitions, discussions about π[1]
DateMarch 14
Next timeMarch 14, 2025 (2025-03-14)
FrequencyAnnual
First time1988
Related toPi Approximation Day

Other dates when people celebrate pi include Pi Approximation Day on July 22 (22/7 in the day/month format, an approximation of π) and June 28 (6.28, an approximation of 2π or tau).

History edit

In 1988, the earliest known official or large-scale celebration of Pi Day was organized by Larry Shaw at the San Francisco Exploratorium,[7] where Shaw worked as a physicist,[8] with staff and public marching around one of its circular spaces, then consuming fruit pies.[9] The Exploratorium continues to hold Pi Day celebrations.[10]

On March 12, 2009, the U.S. House of Representatives passed a non-binding resolution (111 H. Res. 224),[4] recognizing March 14, 2009, as National Pi Day.[11] For Pi Day 2010, Google presented a Google Doodle celebrating the holiday, with the word Google laid over images of circles and pi symbols;[12] and for the 30th anniversary in 2018, it was a Dominique Ansel pie with the circumference divided by its diameter.[13] In Indonesia, as a country that uses the DD/MM/YYYY date format, some people celebrate Pi Day every July 22, referring to another Pi number, namely 22/7.[14]

Some observed the entire month of March 2014 (3/14) as "Pi Month".[15][16] In the year 2015, March 14 was celebrated as "Super Pi Day".[17] 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 π,[18] and later that second, "Pi Instant" represented all of π's digits.[19]

Observance edit

 
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 π, due to a pun based on the words "pi" and "pie" being homophones in English ( /paɪ/), and the coincidental circular shape of many pies.[1][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 pi and 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]

Alternative dates edit

 
Pi Approximation Day is often observed on July 22 (22/7), though this circle is not perfect at illustrating pi.

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 22⁄7 is a common approximation of π, which is accurate to two decimal places and dates from Archimedes.[30]

Two Pi Day, also known as Tau Day, is observed on June 28 (6/28 in the month/day format).[31] 2π, also known by the Greek letter tau (𝜏), is a common multiple in mathematical formulae and approximates to 6.28. Some have argued that 𝜏 is the more fundamental constant and that Tau Day should be celebrated instead.[32][33][34] Celebrations of this date jokingly suggest eating "twice the pie".[35][36][37]

Some also celebrate pi on November 10, since it is the 314th day of the year.[38]

Gallery edit

  •  
    Pi Pie at Delft University
  •  
    A grocery store selling pies for $3.14 on Pi Day
  •  
    Creme pie in celebration of Pi day showing the greek letter and the first digits of Pi.

See also edit

References edit

  1. ^ a b Landau, Elizabeth (March 12, 2010). "On Pi Day, one number 'reeks of mystery'". CNN. Retrieved March 14, 2018.
  2. ^ Bellos, Alex (March 14, 2015). "Pi Day 2015: a sweet treat for maths fans". theguardian.com. Retrieved March 14, 2016.
  3. ^ "Nedräkning mot internationella Pi-dagen". Swedish national radio company (in Swedish). March 14, 2015.
  4. ^ a b United States. Cong. House. Supporting the designation of Pi Day, and for other purposes. 111th Cong. Library of Congress August 7, 2009, at the Wayback Machine
  5. ^ "International Day of Mathematics". UNESCO. March 4, 2020.
  6. ^ Rousseau, Christiane (September 1, 2019). "International Day of Mathematics" (PDF). Notices of the American Mathematical Society. 66 (8): 1. doi:10.1090/noti1928.
  7. ^ Berton, Justin (March 11, 2009). "Any way you slice it, pi's transcendental". San Francisco Chronicle. Retrieved March 18, 2011.
  8. ^ Borwein, Jonathan (March 10, 2011). "The infinite appeal of pi". Australian Broadcasting Corporation. Retrieved March 13, 2011.
  9. ^ Apollo, Adrian (March 10, 2007). "A place where learning pi is a piece of cake" (PDF). The Fresno Bee.
  10. ^ . Exploratorium. Archived from the original on March 14, 2011. Retrieved January 31, 2011.
  11. ^ McCullagh, Declan (March 11, 2009). "National Pi Day? Congress makes it official". Politics and Law. CNET News. Retrieved March 14, 2009.
  12. ^ "Pi Day". Google Doodles. Retrieved October 9, 2012.
  13. ^ "30th Anniversary of Pi Day!". www.google.com. Retrieved March 19, 2018.
  14. ^ Purworini, D. (2016). Pi Day celebration by local scientists in Indonesia. Vol. 7. Anak Sudarti Foundation Bulletin. pp. 7–8.{{cite book}}: CS1 maint: location missing publisher (link)
  15. ^ Main, Douglas (March 14, 2014). "It's Not Just Pi Day, It's Pi Month!". Popular Science. Retrieved July 22, 2014.
  16. ^ "Pi Month Celebration & Circle of Discovery Award Presentation | College of Computer, Mathematical, and Natural Sciences". Cmns.umd.edu. March 11, 2014. Retrieved July 22, 2014.
  17. ^ Mack, Eric (March 14, 2015). "Celebrate The Only Super Pi Day Of The Century". Forbes. Retrieved March 14, 2019.
  18. ^ Ro, Sam (March 13, 2014). "March 14, 2015 Will Be A Once-In-A-Century Thrill For Math Geeks". Business Insider. Retrieved March 13, 2014.
  19. ^ Rosenthal, Jeffrey S. (February 2015). "Pi Instant". Math Horizons. 22 (3): 22. doi:10.4169/mathhorizons.22.3.22. S2CID 218542599.
  20. ^ Smith, K.N. "Wednesday's Google Doodle Celebrates Pi Day". Forbes.
  21. ^ "Celebrate Pi Day With These Deals Around North Texas". NBC DFW. March 13, 2021. Retrieved May 14, 2022.
  22. ^ . YouTube. Archived from the original on October 17, 2013. Retrieved July 22, 2013.
  23. ^ . Honitoncollege.devon.sch.uk. Archived from the original on February 22, 2014. Retrieved July 22, 2013.
  24. ^ McClan, Erin (March 14, 2007). "Pi fans meet March 14 (3.14, get it?)". NBC News. Retrieved January 24, 2008.
  25. ^ "I have SMASHING news!". MIT Admissions. March 7, 2012. Retrieved March 12, 2012.
  26. ^ McGann, Matt (March 13, 2012). "Pi Day, Tau Time". MIT Admissions. Retrieved March 18, 2012.
  27. ^ "Keep your eyes to the skies this Pi Day". MIT Admissions. March 6, 2015. Retrieved March 14, 2018.
  28. ^ "[Pinned] This is the way...to check your decisions". MIT Admissions. March 10, 2020. Retrieved March 14, 2020.
  29. ^ a b "Princeton Pi Day & Einstein Birthday Party". Princeton Regional Convention and Visitors Bureau. Retrieved February 9, 2019.
  30. ^ . Today in History. Verizon Foundation. Archived from the original on December 1, 2010. Retrieved January 30, 2011.
  31. ^ . Archived from the original on January 12, 2013.
  32. ^ "It's Pi Day today. But these people say we should refuse to celebrate it". The Independent. March 13, 2018. Archived from the original on May 26, 2022. Retrieved March 14, 2018.
  33. ^ . March 14, 2013. Archived from the original on March 14, 2013. Retrieved March 14, 2018.
  34. ^ BMJ (June 22, 2018). "Jeffrey Aronson: When I use a word ... The Days of Pi". The BMJ. Retrieved May 2, 2023.
  35. ^ Bartholomew, Randyn Charles. Why Tau Trumps Pi.
  36. ^ Landau, Elizabeth. "In case Pi Day wasn't enough, it's now 'Tau Day' on the Internet". CNN.
  37. ^ "Tau Day – Come Eat Twice the (Pi)e".
  38. ^ "Pi Day – Fun Holiday". Timeanddate.com. Retrieved March 13, 2022.

External links edit

 
Wikimedia Commons has media related to Pi Day.
 
Look up Pi Day in Wiktionary, the free dictionary.
  • Exploratorium's Pi Day Web Site
  • Official website of the International Day of Mathematics
  • UNESCO page on the International Day of Mathematics
  • NPR provides a "Pi Rap" audiovideo
  • Pi Day
  • Professor Lesser's Pi Day page
  • 数学漫谈 (A Tour of Mathematics), a public lecture (in Chinese) delivered by Professor Ya-xiang Yuan (President of International Council for Industrial and Applied Mathematics) on 14 March 2020, the first International Day of Mathematics (slides)

January 01, 1970
confused, with, national, annual, celebration, mathematical, constant, observed, march, month, since, first, three, significant, figures, first, celebrated, united, states, founded, 1988, larry, shaw, employee, francisco, science, museum, exploratorium, celebr. Not to be confused with National Pie Day Pi Day is an annual celebration of the mathematical constant p pi Pi Day is observed on March 14 the 3rd month since 3 1 and 4 are the first three significant figures of p and it was first celebrated in the United States 2 3 It was founded in 1988 by Larry Shaw an employee of the San Francisco science museum 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 4 UNESCO s 40th General Conference designated Pi Day as the International Day of Mathematics in November 2019 5 6 Pi DayLarry Shaw the organizer of the first Pi Day celebration at the Exploratorium in San FranciscoObserved byUnited StatesTypeMathematicalSignificance3 1 and 4 are the three most significant figures of p in its decimal representation CelebrationsPie eating pi memorization competitions discussions about p 1 DateMarch 14Next timeMarch 14 2025 2025 03 14 FrequencyAnnualFirst time1988Related toPi Approximation Day Other dates when people celebrate pi include Pi Approximation Day on July 22 22 7 in the day month format an approximation of p and June 28 6 28 an approximation of 2p or tau Contents 1 History 2 Observance 3 Alternative dates 4 Gallery 5 See also 6 References 7 External linksHistory editIn 1988 the earliest known official or large scale celebration of Pi Day was organized by Larry Shaw at the San Francisco Exploratorium 7 where Shaw worked as a physicist 8 with staff and public marching around one of its circular spaces then consuming fruit pies 9 The Exploratorium continues to hold Pi Day celebrations 10 On March 12 2009 the U S House of Representatives passed a non binding resolution 111 H Res 224 4 recognizing March 14 2009 as National Pi Day 11 For Pi Day 2010 Google presented a Google Doodle celebrating the holiday with the word Google laid over images of circles and pi symbols 12 and for the 30th anniversary in 2018 it was a Dominique Ansel pie with the circumference divided by its diameter 13 In Indonesia as a country that uses the DD MM YYYY date format some people celebrate Pi Day every July 22 referring to another Pi number namely 22 7 14 Some observed the entire month of March 2014 3 14 as Pi Month 15 16 In the year 2015 March 14 was celebrated as Super Pi Day 17 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 p 18 and later that second Pi Instant represented all of p s digits 19 Observance edit nbsp 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 p due to a pun based on the words pi and pie being homophones in English p aɪ and the coincidental circular shape of many pies 1 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 pi and 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 Alternative dates edit nbsp Pi Approximation Day is often observed on July 22 22 7 though this circle is not perfect at illustrating pi 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 22 7 is a common approximation of p which is accurate to two decimal places and dates from Archimedes 30 Two Pi Day also known as Tau Day is observed on June 28 6 28 in the month day format 31 2p also known by the Greek letter tau 𝜏 is a common multiple in mathematical formulae and approximates to 6 28 Some have argued that 𝜏 is the more fundamental constant and that Tau Day should be celebrated instead 32 33 34 Celebrations of this date jokingly suggest eating twice the pie 35 36 37 Some also celebrate pi on November 10 since it is the 314th day of the year 38 Gallery edit nbsp Pi Pie at Delft University nbsp A grocery store selling pies for 3 14 on Pi Day nbsp Creme pie in celebration of Pi day showing the greek letter and the first digits of Pi See also editLists of holidays Mole Day Sequential time Square Root Day Doomsday ruleReferences edit a b Landau Elizabeth March 12 2010 On Pi Day one number reeks of mystery CNN Retrieved March 14 2018 Bellos Alex March 14 2015 Pi Day 2015 a sweet treat for maths fans theguardian com Retrieved March 14 2016 Nedrakning mot internationella Pi dagen Swedish national radio company in Swedish March 14 2015 a b United States Cong House Supporting the designation of Pi Day and for other purposes 111th Cong Library of Congress Archived August 7 2009 at the Wayback Machine International Day of Mathematics UNESCO March 4 2020 Rousseau Christiane September 1 2019 International Day of Mathematics PDF Notices of the American Mathematical Society 66 8 1 doi 10 1090 noti1928 Berton Justin March 11 2009 Any way you slice it pi s transcendental San Francisco Chronicle Retrieved March 18 2011 Borwein Jonathan March 10 2011 The infinite appeal of pi Australian Broadcasting Corporation Retrieved March 13 2011 Apollo Adrian March 10 2007 A place where learning pi is a piece of cake PDF The Fresno Bee Exploratorium 22nd Annual Pi Day Exploratorium Archived from the original on March 14 2011 Retrieved January 31 2011 McCullagh Declan March 11 2009 National Pi Day Congress makes it official Politics and Law CNET News Retrieved March 14 2009 Pi Day Google Doodles Retrieved October 9 2012 30th Anniversary of Pi Day www google com Retrieved March 19 2018 Purworini D 2016 Pi Day celebration by local scientists in Indonesia Vol 7 Anak Sudarti Foundation Bulletin pp 7 8 a href Template Cite book html title Template Cite book cite book a CS1 maint location missing publisher link Main Douglas March 14 2014 It s Not Just Pi Day It s Pi Month Popular Science Retrieved July 22 2014 Pi Month Celebration amp Circle of Discovery Award Presentation College of Computer Mathematical and Natural Sciences Cmns umd edu March 11 2014 Retrieved July 22 2014 Mack Eric March 14 2015 Celebrate The Only Super Pi Day Of The Century Forbes Retrieved March 14 2019 Ro Sam March 13 2014 March 14 2015 Will Be A Once In A Century Thrill For Math Geeks Business Insider Retrieved March 13 2014 Rosenthal Jeffrey S February 2015 Pi Instant Math Horizons 22 3 22 doi 10 4169 mathhorizons 22 3 22 S2CID 218542599 Smith K N Wednesday s Google Doodle Celebrates Pi Day Forbes Celebrate Pi Day With These Deals Around North Texas NBC DFW March 13 2021 Retrieved May 14 2022 Honiton Community College Pi Day Jazmin Year 9 YouTube Archived from the original on October 17 2013 Retrieved July 22 2013 HCC Celebrate International Pi Day Honitoncollege devon sch uk Archived from the original on February 22 2014 Retrieved July 22 2013 McClan Erin March 14 2007 Pi fans meet March 14 3 14 get it NBC News Retrieved January 24 2008 I have SMASHING news MIT Admissions March 7 2012 Retrieved March 12 2012 McGann Matt March 13 2012 Pi Day Tau Time MIT Admissions Retrieved March 18 2012 Keep your eyes to the skies this Pi Day MIT Admissions March 6 2015 Retrieved March 14 2018 Pinned This is the way to check your decisions MIT Admissions March 10 2020 Retrieved March 14 2020 a b Princeton Pi Day amp Einstein Birthday Party Princeton Regional Convention and Visitors Bureau Retrieved February 9 2019 Pi Approximation Day is celebrated today Today in History Verizon Foundation Archived from the original on December 1 2010 Retrieved January 30 2011 Tau Day Why you should eat twice the pie Archived from the original on January 12 2013 It s Pi Day today But these people say we should refuse to celebrate it The Independent March 13 2018 Archived from the original on May 26 2022 Retrieved March 14 2018 Pi Day Turns 25 Why We Celebrate an Irrational Number March 14 2013 Archived from the original on March 14 2013 Retrieved March 14 2018 BMJ June 22 2018 Jeffrey Aronson When I use a word The Days of Pi The BMJ Retrieved May 2 2023 Bartholomew Randyn Charles Why Tau Trumps Pi Landau Elizabeth In case Pi Day wasn t enough it s now Tau Day on the Internet CNN Tau Day Come Eat Twice the Pi e Pi Day Fun Holiday Timeanddate com Retrieved March 13 2022 External links edit nbsp Wikimedia Commons has media related to Pi Day nbsp Look up Pi Day in Wiktionary the free dictionary Exploratorium s Pi Day Web Site Official website of the International Day of Mathematics UNESCO page on the International Day of Mathematics NPR provides a Pi Rap audiovideo Pi Day Professor Lesser s Pi Day page 数学漫谈 A Tour of Mathematics a public lecture in Chinese delivered by Professor Ya xiang Yuan President of International Council for Industrial and Applied Mathematics on 14 March 2020 the first International Day of Mathematics slides Retrieved from https en wikipedia org w index php title Pi Day amp oldid 1213959751, wikipedia, wiki, book, books, library,

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