Pi Day and Pi Approximation Day are two holidays held to celebrate the mathematical constant π (pi) (in the mm/dd date notation: 3/14); since 3, 1 and 4 are the first three digits of π. March 14 is also the birthday of Albert Einstein and the two events are sometimes celebrated together. Pi Approximation Day is observed on July 22, because of Archimedes' popular approximation of π being 22/7. However, this may be considered misleading, as all cited dates are "approximation days" (as π is an irrational number) and 22/7 is actually a closer approximation of π than 3.14 is. Typically, March 14 is more popular for countries using the month/day format (22/7 being an impossible date in this format), and the 22nd of July is more popular for countries using the day/month format (since 3/14 and 31/4 are impossible dates in this format).
Sometimes Pi Minute is also celebrated; this occurs on March 14 at 1:59 p.m. If π is truncated to seven decimal places, it becomes 3.1415926; making March 14 at 1:59:26 p.m., Pi Second (or sometimes March 14, 1592 at 6:53:58 a.m.).
There are a large variety of ways of celebrating Pi Day and most of them include eating pie and discussing the relevance of π. The first Pi Day celebration was held at the San Francisco Exploratorium in 1988, with staff and public marching around one of its circular spaces, then consuming fruit pies. The museum has since added pizza to its Pi Day menu. The founder of Pi Day was Larry Shaw, a now-retired physicist at the Exploratorium who still helps out with the celebrations.
The Massachusetts Institute of Technology often mails its acceptance letters to be delivered to prospective students on Pi Day.
3月14日是圓周率日的正式日子，從圓周率常用的近似值3.14而來。通常是在下午1時59分慶祝，以象徵圓周率的六位近似值3.14159。一些用24小時記時的人會改在凌晨1時59分或下午3時9分（15時9分）。全球各地的一些大學數學系在這天開派對慶祝。
美國麻省理工學院首先倡議將3日14日（寓意3﹒14）定為國際圓周率日(National pi Day)。2009年美國眾議院正式通過將每年的3月14號設定為「圓周率日」（Pi day） (HRES 224),[1][2]
3月14日也是阿爾伯特·愛因斯坦的生日。
這一天有不同的慶祝方式。一些圓周率會的人們會聚在一起思考圓周率在他們生活中的角色，和沒有了圓周率的世界會是怎樣。圓周率日慶祝者也會給予圓周率不同數值：吃圓周率，玩圓周率，喝圓周率；這裏圓周率（pi）等於餡餅（pie），彩罐遊戲（piñata），和一種雞尾酒（piña colada）。
「終極」圓周率日是1592年3月14日上午6時54分。這時間以美國式記法是3/14/1592 6:54，對應了圓周率的十位近似值3.141592654。
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