Pi Approximation Day occurs every July 22nd. It celebrates pi, a key mathematical constant. Pi relates a circle's circumference to its diameter. William Jones introduced the π symbol in 1706.

This day only comes 'round' once every year!

Each March 14 (3/14) mathematicians and science enthusiasts celebrate Pi Day, honoring the mathematical constant π (pi).

Some numbers are useful. Some are famous. And then there is pi, a number so absurdly powerful that humanity has spent ...

Pi refers to the ratio of a circle’s circumference to its diameter. The concept was popularised in 1988 when physicist Larry ...