|
Pi Day is an annual celebration of the mathematical constant (pi). Pi Day is observed on March 14 (3/14 in the ''month/day'' date format) since 3, 1, and 4 are the first three significant digits of .〔(Dagens Nyheter - Article in the biggest Swedish newspaper ) Read 2015-03-14〕〔(Liber - a big Swedish school book publisher ) Read 2015-03-14〕〔(Program on Sveriges Radio - Swedish national radio company ) Read 2015-03-14〕〔(【引用サイトリンク】title=American Pi: Why the Day Belongs to the U.S. (and Belize) )〕 In 2009, the United States House of Representatives supported the designation of Pi Day.〔United States. Cong. House. Supporting the designation of Pi Day, and for other purposes. 111th Cong. (Library of Congress ).〕 Pi Approximation Day is observed on July 22 (22/7 in the ''day/month'' date format), since the fraction is a common approximation of , which is accurate to two decimal places and dates from Archimedes. ==History== The earliest known official or large-scale celebration of Pi Day was organized by Larry Shaw in 1988 at the San Francisco Exploratorium, where Shaw worked as a physicist, with staff and public marching around one of its circular spaces, then consuming fruit pies. The Exploratorium continues to hold Pi Day celebrations.〔(【引用サイトリンク】url=http://www.exploratorium.edu/pi/index.html )〕 On March 12, 2009, the U.S. House of Representatives passed a non-binding resolution (HRES 224),〔 recognizing March 14, 2009 as National Pi Day. For Pi Day 2010, Google presented a Google Doodle celebrating the holiday, with the word Google laid over images of circles and pi symbols. The entire month of March 2014 (3/14) was observed by some as "Pi Month". In the year 2015, Pi Day had special significance on 3/14/15 (''mm/dd/yy'' date format) at 9:26:53 a.m. and also at p.m., with the date and time representing the first 10 digits of . That same second also contained a precise instant corresponding to ''all'' of the digits of . 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Pi Day」の詳細全文を読む スポンサード リンク
|