| 词条 | Square Root Day |
| 释义 |
Square Root Day is an unofficial holiday celebrated on days when both the day of the month and the month are the square root of the last two digits of the year.[1] For example, the last Square Root Day was April 4, 2016 (4/4/16), and the next Square Root Day will be May 5, 2025 (5/5/25).{{Update after|2025|5|5}} The final Square Root Day of the century will occur on September 9, 2081. Square Root Days fall upon the same nine dates each century. Ron Gordon, a Redwood City, California high school teacher, created the first Square Root Day for September 9, 1981 (9/9/81). Gordon remains the holiday's publicist, sending news releases to world media outlets.[2] Gordon's daughter set up a Facebook group where people can share how they were celebrating the day.[3] One suggested way of celebrating the holiday is by eating square radishes, or other root vegetables cut into shapes with square cross sections (thus creating a "square root").[4] Full list of Square Root DaysSquare Root Day occurs on the following dates each century:
Distribution of Square Root DaysThe number of years between consecutive Square Root Days in a century are consecutive odd numbers: 3, 5, 7, 9, 11, 13, 15, 17. This illustrates the fact that every odd number is the difference of two consecutive squares. See also
References1. ^{{cite news |title= A day getting to the root |last= Wong |first= Nicole C. |work= The Mercury News |url= http://www.mercurynews.com/mld/mercurynews/news/7854616.htm |date= 2004-02-02 |accessdate= 2007-02-20 |archiveurl = https://web.archive.org/web/20040818204722/http://www.mercurynews.com/mld/mercurynews/news/7854616.htm |archivedate = 2004-08-18}} 2. ^{{cite news |title=Have a rootin' tootin' Square Root Day |last=Hill |first=Angela |work=Oakland Tribune |url= http://www.insidebayarea.com/oaklandtribune/localnews/ci_11821782?source=rss |date=2009-03-02 |accessdate= 2009-03-02}} 3. ^{{cite news|title=Math Fans to Celebrate Square Root Day |work=Yahoo News |url=https://news.yahoo.com/s/ap/20090303/ap_on_fe_st/odd_square_root_day |date=2009-03-02 |accessdate=2009-03-02 |deadurl=yes |archiveurl=https://web.archive.org/web/20090306184913/http://news.yahoo.com/s/ap/20090303/ap_on_fe_st/odd_square_root_day |archivedate=March 6, 2009 }} 4. ^{{cite news |title=Square Root Day revelers to party like it's 3/3/09 |last=Musil |first=Steven |work=cnet news |url= http://news.cnet.com/8301-11386_3-10186121-76.html?part=rss&subj=news&tag=2547-1_3-0-5 |date=2009-03-02 |accessdate=2009-03-02}} 3 : Unofficial observances|Observances about science|Recurring events established in 1981 |
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