Born on March 14
Pi Day
A slice for every digit.
Next: March 14, 2027
Where it comes from
Pi Day was born at the Exploratorium, San Francisco's science museum, in 1988. At a staff retreat in Monterey, the physicist and tinkerer Larry Shaw noticed that 14 March, written 3.14, matches the first digits of pi, the never-ending number that links a circle's circumference to its width.
How it's celebrated
Maths lovers, schools and museums around the world eat pie, recite as many digits as they can and set circle puzzles. The Exploratorium still holds a public Pi Day each year.
Did you know
Shaw's Pi Shrine is a circular brass plaque in the centre of a circular classroom built from circular cinderblocks.
Star sign
Pisces · February 19 – March 20 · Water sign
Dreamy and kind, with an artist's imagination.