3月14日是什么日子?很多人被搞得一头雾水。您知道“国际圆周率日”吗?圆周率?没错，就是3.141592653……

　　Story highlights Pi Day is celebrated March 14 in honor of the famed irrational number San Francisco’s Exploratorium and Princeton, New Jersey, go all out.

　　3月14日是圆周率日，旧金山探索博物馆和普林斯顿，新泽西州都庆祝了这个节日。

　　Math enthusiasts know all about it, and the rest of the population is probably hoping for cherry pie.

　　很多数学爱好者都知道这一天，其他人大多只是想吃樱桃派。

　　But March 14 is Pi Day. While last year stretched the symbolic celebration out a little longer -- to 3.1415 -- each year presents ample opportunity for learning.

　　但是3月14日才是圆周率日。去年这个节日庆祝圆周率稍微久了一些，每年都有大量学习的机会。

　　To 31 decimal places, the celebrated irrational number that never ends is 3.1415926535897932384626433832795.

　　这个无限循环小数的前31位是3.1415926535897932384626433832795。

　　A few more tidbits about pi and Pi Day:

　　关于圆周率和圆周率日的一些知识

　　About pi

　　圆周率

　　Pi is the ratio of the circumference of a circle to its diameter. It’s not equal to the ratio of any two whole numbers, so an approximation -- 22/7 -- is used in many calculations.

　　圆周率是一个圆的周长与其直径的比值。这不等于任何一个整数的比例，所以类似于22 / 7这样的比值可以在很多计算中使用。

　　Pi is essential in architecture and construction and was used frequently by early astronomers. Pi has been known for about 4,000 years, but it started to be called by the Greek letter only in the 1700s.

　　圆周率在建筑学和建造工程中是必不可少的，早期的天文学家也经常使用它。圆周率已经存在大约4000年了，但是到18世纪才开始用作希腊字母表示。

　　The origin of Pi Day

　　圆周率日的起源

　　Pi Day started 28 years ago at San Francisco’s Exploratorium.

　　圆周率日始于28年前旧金山的探索博物馆。

　　Physicist Larry Shaw, who worked in the electronics group at the museum, started celebrating pi on March 14, 1988, primarily with museum staffers. The tradition has grown to embrace math enthusiasts from all walks of life.

　　物理学家Larry Shaw，在博物馆的电子学小组工作，于1988年3月14日和博物馆同事开始庆祝圆周率日。

　　Celebrations

　　庆祝仪式

　　This year, the Exploratorium is hosting a day-long celebration at its facility on Pier 15, including a Pi Procession, pi "explorables" and servings of pie.

　　今年，探索博物馆庆祝圆周率日，包括背诵圆周率，圆周率探索和吃派。

　　Pi Day is also Albert Einstein’s birthday. In Princeton, New Jersey, where Einstein lived for more than two decades, signs of the scientist permeate the Pi Day festivities, which span five days.

　　圆周率日也是爱因斯坦的生日。爱因斯坦曾在在普林斯顿、新泽西生活了20多年，以这位科学家的生日来标志圆周率日，庆祝时间大约持续五天。

　　On Saturday, there’s a birthday party for Einstein at Morven Museum and Garden and Einstein lookalike and apple pie contests at the Nassau Inn.

　　周六，在Morven 博物馆公园，为庆祝爱因斯坦生日举办了小型聚会，很多长得很像爱因斯坦的人参加这个聚会，在拿骚小酒馆举行了苹果派比赛。

（编辑：何莹莹）