PI Approximation Day : Significance, History And Interesting Facts About Pi


We all must be familiar with our favourite mathematical sign “π,” or Pi, which is the ratio of the circumference of a circle and its diameter. But do you know that a day is also celebrated in its name?…Yes! The Pi Approximation Day is observed on July 22 every year to honour the concept of Pi.

PI which is denoted by a Greek symbol π, is a never ending and never repeating rational number which approximates to 3.14 or 22/7 in fraction. So let’s know about some interesting facts on PI Approximation Day 2022.

Why is Pi Approximation Day Celebrated?

The Pi Approximation day is celebrated every year on 22 of July. As the fraction 22/7 is an approximate value of Pi. So the day is observed on 22nd of July, as the numerator 22 represents the date and denominator 7 represents the month of July.

History of PI

While looking at the history of Pi then we found that Pi has been existing for nearly 4000 years in one or another form. Ancient Babylonians (an ancient city of Iraq) first time used Pi and approximated the value of Pi to 3.125. In around 250 B.C. Pi was first calculated by one of the famous ancient Mathematicians, Archimedes of Syracuse, Italy. Archimedes found its value between 3 1/7 to 3 10/71. Pi, which is represented by the Greek symbol π, is also known as the Archimedes’ Constant. Let’s know more about the journey of Pi in the following points.

  • In the mid-400, a Mathematician named Zu Chongzhi, calculated the value of Pi in his own way. Archimedes and Zu Chongzhi were the 1st two persons who calculated the value of PI by their own.
  • Archimedes approximated the value of Pi by using circumscribed and inscribed polygons. This algorithm remained dominant for the next 1000 years.
  • In 1630, Christoph Grienberger, an Australian astronomer found the most correct approximation of PI till 38 digits.
  • The Greek Symbol for PI came into existence 1706. It was suggested by William Jones, who was a Welsh mathematician and became popularized when it was used by Leonhard Euler in 1737.
  • For the first time in 1957, the value of Pi was calculated by using Machine when George Reitwiesner and John von Neumann used an ENIAC computer to compute 2,037 digits of pi. Today with the use of computer algorithms, we are able to approximate the proper value of irrational, infinite numbers.
  • Emma Haruka Iwao, a Google employee who has calculated the 100 trillionth digit of Pi has recorded her name in the Guinness Book of World Records in 2022.

Interesting Facts On Pi

Here we are listing some of the interesting facts on Pi.

  • Pi or the Archimedes Constant is equal to the ratio of a circle’s circumference to its diameter: C/D and commonly approximated as 3.14159.
  • The Value of Pi goes on as its an infinite number.
  • The mirror image of 3.14 reflects PIE.
  • Pi is a part of Egyptian mythology. It is being said that the Pyramids of Giza are built with the principles of Pi.
  • The calculation of the value of Pi can be used as a stress test for a computer processor.


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