(CNN) Math enthusiasts know all about it, and the rest of the population is probably hoping for cherry pie.
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.
To 31 decimal places, the celebrated irrational number that never ends is 3.1415926535897932384626433832795.
A few more tidbits about pi and Pi Day:About pi
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.
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.The origin of Pi Day
Pi Day started 28 years ago at San Francisco’s Exploratorium.
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.Celebrations
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.
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.
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.
Plus the requisite pie-throwing event.
For more about pi, visit www.piday.org.CNN’s Elizabeth Landau contributed to this report.