| 词条 | Pi Day | |||
| 释义 |
|holiday_name = Pi Day |image = prince-of-pi.jpg |caption = Larry Shaw, the organizer of the first Pi Day celebration at the Exploratorium in San Francisco |observedby = |significance = 3, 1, and 4 are the three most significant figures 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, discussions about {{pi}}[1] |relatedto = Pi Approximation Day }}{{Pi box}}Pi Day is an annual celebration of the mathematical constant {{pi}} (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 {{pi}}.[2][3] In 2009, the United States House of Representatives supported the designation of Pi Day.[4]Pi Approximation Day is observed on July 22 (22/7 in the day/month format), since the fraction {{frac|22|7}} is a common approximation of {{pi}}, which is accurate to two decimal places and dates from Archimedes.[5]Two Pi Day, also known as Tau Day, is lightly observed on June 28 (6/28 in the month/day format).[6] HistoryIn 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 {{ill|Dominique Ansel|fr}} pie with the circumference divided by its diameter.[13] The entire month of March 2014 (3/14) was observed by some as "Pi Month".[14][15] In the year 2015, March 14 was celebrated as "Super Pi Day".[16] 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 {{pi}}.[17] ObservancePi Day has been observed in many ways, including eating pie, throwing pies and discussing the significance of the number {{pi}}, due to a pun based on the words "pi" and "pie" being homophones in English ({{IPAc-en|pron|p|aɪ}}), and the coincidental circular nature of a pie.[1][18] Massachusetts Institute of Technology has often mailed its application decision letters to prospective students for delivery on Pi Day.[19] 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.[20][21] In 2015, the regular decisions were put online at 9:26 am, following that year's "pi minute".[22] June 28 is "Two Pi Day", also known as "Tau Day". 2{{pi}}, also known by the Greek letter tau (τ) 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.[23][24] Celebrations of this date jokingly suggest eating "twice the pie".[25][26][27]Princeton, New Jersey, hosts numerous events in a combined celebration of Pi Day and Albert Einstein's birthday, which is also March 14.[28] 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.[28]See also
References1. ^1 {{Cite web |url=http://www.cnn.com/2010/TECH/03/12/pi.day.math/index.html |title=On Pi Day, one number 'reeks of mystery' |last=Landau |first=Elizabeth |date=March 12, 2010 |publisher=CNN |language=en |access-date=March 14, 2018}} 2. ^{{cite web|url=https://www.theguardian.com/science/2015/mar/13/pi-day-celebration-maths-fans-language-memory-contests|title=Pi Day 2015: a sweet treat for maths fans|last=Bellos|first=Alex|website=theguardian.com|date=March 14, 2015|accessdate=March 14, 2016}} 3. ^Program on Sveriges Radio – Swedish national radio company Read March 14, 2015 4. ^1 United States. Cong. House. Supporting the designation of Pi Day, and for other purposes. 111th Cong. Library of Congress. 5. ^{{cite web|title=Pi Approximation Day is celebrated today.|url=http://www.thinkfinity.org/2010-07-22_pi-approximation-day|work=Today in History|publisher=Verizon Foundation|accessdate=January 30, 2011}} 6. ^Tau Day: Why you should eat twice the pie – Light Years – CNN.com Blogs {{webarchive|url=https://web.archive.org/web/20130112211136/http://lightyears.blogs.cnn.com/2012/06/28/tau-day-why-you-should-eat-twice-the-pie/ |date=January 12, 2013 }} 7. ^{{cite web | url = http://articles.sfgate.com/2009-03-11/entertainment/17211858_1_pi-day-pi-shrine-einstein-s-birthday | title = Any way you slice it, pi's transcendental | last = Berton | first = Justin | date = March 11, 2009 | work = San Francisco Chronicle | accessdate=March 18, 2011}} 8. ^{{Cite web |url=http://www.abc.net.au/science/articles/2011/03/10/3158045.htm?site=science/opinion |title=The infinite appeal of pi |last=Borwein |first=Jonathan |authorlink=Jonathan Borwein |date=March 10, 2011 |publisher=Australian Broadcasting Corporation |access-date=March 13, 2011}} 9. ^{{Cite news |url=http://apollotutoring.com/pi_day.pdf |title=A place where learning pi is a piece of cake |last=Apollo |first=Adrian |date=March 10, 2007 |publisher=The Fresno Bee}} 10. ^{{cite web|title=Exploratorium 22nd Annual Pi Day|url=http://www.exploratorium.edu/pi/index.html|publisher=Exploratorium|accessdate=January 31, 2011}} 11. ^{{cite news | url = http://news.cnet.com/8301-13578_3-10194354-38.html?part=rss&subj=news&tag=2547-1_3-0-5 | title = National Pi Day? Congress makes it official | work = Politics and Law | last = McCullagh | first = Declan | publisher = CNET News | date = March 11, 2009 | accessdate = March 14, 2009}} 12. ^{{cite web|title=Pi Day|url=https://www.google.com/doodles/pi-day|work=Google Doodles|publisher=Google|accessdate=October 9, 2012}} 13. ^{{Cite web|url=https://www.google.com/doodles/30th-anniversary-of-pi-day|title=30th Anniversary of Pi Day!|website=www.google.com|language=en|access-date=March 19, 2018}} 14. ^{{Cite web |url=http://www.popsci.com/article/science/its-not-just-pi-day-its-pi-month |title=It's Not Just Pi Day, It's Pi Month! |last=Main |first=Douglas |date=March 14, 2014 |publisher=Popular Science |access-date=July 22, 2014}} 15. ^{{cite web|url=http://cmns.umd.edu/news-events/events/1774 |title=Pi Month Celebration & Circle of Discovery Award Presentation | College of Computer, Mathematical, and Natural Sciences |publisher=Cmns.umd.edu |date=March 11, 2014 |accessdate=July 22, 2014}} 16. ^{{Cite web|url=https://www.forbes.com/sites/ericmack/2015/03/14/happy-super-pi-day-heres-how-to-celebrate/|title=Celebrate The Only Super Pi Day Of The Century|last=Mack|first=Eric|website=Forbes|date=Mar 14, 2015|language=en|access-date=2019-03-14}} 17. ^{{Cite web |url=http://www.businessinsider.com/pi-day-2015-2014-3 |title=March 14, 2015 Will Be A Once-In-A-Century Thrill For Math Geeks |last=Ro |first=Sam |date=March 13, 2014 |website=Business Insider |access-date=March 13, 2014}} 18. ^{{cite web|url=https://www.forbes.com/sites/kionasmith/2018/03/14/wednesdays-google-doodle-celebrates-pi-day/|title=Wednesday's Google Doodle Celebrates Pi Day|first=K.N.|last=Smith|publisher=}} 19. ^{{Cite news | url = http://www.msnbc.msn.com/id/17605924/ | title = Pi fans meet March 14 (3.14, get it?) | first = Erin | last = McClan | publisher = msnbc.com | date = March 14, 2007 | accessdate = January 24, 2008}} 20. ^{{cite web|title=I have SMASHING news!|url=http://mitadmissions.org/blogs/entry/i-have-smashing-news|publisher=MIT Admissions|accessdate=March 12, 2012}} 21. ^{{cite web|last=McGann|first=Matt|title=Pi Day, Tau Time|url=http://mitadmissions.org/blogs/entry/pi-day-tau-time|publisher=MIT Admissions|accessdate=March 18, 2012}} 22. ^{{Cite web |url=http://mitadmissions.org/blogs/entry/keep-your-eyes-to-the-skies |title=Keep your eyes to the skies this Pi Day |publisher=MIT Admissions |language=en |access-date=March 14, 2018}} 23. ^{{Cite news|url=https://www.independent.co.uk/news/science/pi-day-march-14-maths-google-doodle-pie-baking-celebrate-30-anniversary-a8254036.html|title=It's Pi Day today. But these people say we should refuse to celebrate it|date=March 13, 2018|work=The Independent|access-date=March 14, 2018|language=en-GB}} 24. ^{{Cite news|url=https://news.nationalgeographic.com/news/2013/03/031314-pi-day-exploratorium-mathematics-pie-science/|title=Pi Day Turns 25: Why We Celebrate an Irrational Number|date=March 14, 2013|access-date=March 14, 2018}} 25. ^{{cite journal|last1=Bartholomew|first1=Randyn Charles|title=Why Tau Trumps Pi|journal=Scientific American|url=https://www.scientificamerican.com/article/let-s-use-tau-it-s-easier-than-pi/|language=en}} 26. ^{{cite news|last1=Landau|first1=Elizabeth|title=In case Pi Day wasn't enough, it's now 'Tau Day' on the Internet|url=http://www.cnn.com/2011/TECH/innovation/06/28/tau.day.math/index.html|work=CNN|language=en}} 27. ^{{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}} 28. ^1 {{Cite web |url=https://www.visitprinceton.org/events/annual-events/pi-day/ |title=Princeton Pi Day & Einstein Birthday Party |website=Princeton Regional Convention and Visitors Bureau |access-date=February 9, 2019}} External links{{Commons category|Pi Day}}
7 : 1988 establishments in California|March observances|July observances|Observances about science|Pi|Recurring events established in 1988|Unofficial observances |
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