Today is Pi Approximation Day. Pi is a constant used in Mathematics and other branches of Science. The Pi Approximation Day is celebrated on July 22 every year, as today’s date (22 – 7) in the day/month format is written as 22/7, which is the approximate value of Pi.

**History of Pi Day**: The first Pi Day celebration was held at the San Francisco Exploratorium in 1988, with staff and public marching around one of its circular spaces, then consuming fruit pies. The museum has since added pizza to its Pi Day menu. The founder of Pi Day was Larry Shaw, a now-retired physicist at the Exploratorium who still helps out with the celebrations. (source and image credit: Wikipedia)

The Pi is an irrational number with a non-termination and non-repeating decimal value. Hence for the calculation purposes, the approximate value of Pi (i.e.; 22/7) is used. Several Greek and Egyptian mathematicians are credited for the determination of value of Pi, but Indian mathematicians were able to calculate the correct value of Pi for long even before the Greeks.

A very happy Pi Approximation Day to all mathematicians!