Pi Approximation Day 2023

Pi Approximation Day is celebrated on July 22 (22/7) because the fraction 22⁄7 is a well-known and common approximation of the mathematical constant π (pi). This fraction accurately represents π to two decimal places and dates back to the work of the ancient Greek mathematician Archimedes.

On March 14 (3/14), another celebration called Pi Day takes place, as the date corresponds to the first three digits of π (3.14). Pi Day is particularly popular in the United States, where the month/day date format is commonly used.

Both Pi Approximation Day and Pi Day are occasions to honor the significance of π in mathematics and its widespread application in various scientific fields. These celebrations bring attention to the fascinating world of numbers and the profound influence of π in our understanding of the universe.

History of Pi Approximation Day

Pi (π) has a long history and has been known and used for almost 4000 years. The ancient Babylonians and Egyptians approximated the value of pi to be around three. Archimedes, a renowned mathematician from ancient Greece, made significant contributions to the calculation of pi and determined that its value lies between 3 1/7 and 3 10/71.

Pi Approximation Day is observed annually to celebrate the mathematical constant π. It falls on July 22, and the date is represented as 22/7, which is a common approximation of pi. Another celebration, known as Pi Day, is observed on March 14 (3/14), as it corresponds to the first three digits of pi (3.14). Pi Day was founded by Larry Shaw in 1988, and in November 2019, the United Nations designated it as the International Day of Mathematics, further highlighting the significance of this mathematical constant in our lives.

What is Pi?

Pi (π) is a mathematical constant that is the ratio of the circumference of a circle to its diameter.

  • It is an irrational number, which means that it cannot be expressed as a fraction of two integers.
  • In decimal form, pi is approximately equal to 3.14159. However, pi is an infinite number, and its decimal expansion never repeats or terminates.
  • Pi is a very important number in mathematics and science. It is used in many formulas, including the formula for the area of a circle.

Interesting Facts About Pi:

  • The first three digits of pi were first calculated by Archimedes in the 3rd century BC and that’s why it is also referred to as Archimedes Constant.
  • Pi is used in the construction of bridges, buildings, and other structures.
  • Pi is also used in the design of computer chips and other electronic devices.
  • Pi has been calculated to over 13 trillion digits.
  • There is a mathematical constant called tau, which is equal to 2π.
  • There is no zero in the first 31 digits of PiAt position 763 which is also known as Feynman Point, there are six nines in a row.
  • In 2015, Suresh Kumar Sharma, a former vegetable vendor from Jaipur, Rajasthan now a memory coach, set a world record when he successfully recited more than 70,030 digits of pi.
  • It took 17 hours to complete the memorization.
  • Johann Lambert proved Pi is irrational in 1768
  • As the exact value of pi cannot be calculated, we can never find the accurate area or circumference of a circle.
  • The Welsh mathematician William Jones began using the symbol for pi in 1706.
  • Lu Chao of China recited 67,890 digits of pi in the year 2005.

Pi Approximation Day – FAQs

What is Pi Approximation Day?

Pi Approximation Day is celebrated on July 22nd, which is when the date (22/7) approximates the value of pi (3.14). The day is a celebration of mathematics and pi, and there are many ways to celebrate, like eating pie, watching pi movies, or participating in pi competitions.

How many digits of Pi have been calculated?

As of March 14, 2023, the most digits of pi that have been calculated are 13 trillion. This was calculated by a supercomputer at the University of Tokyo.


  • Shubham Mittal

    Shubham Mittal is a renowned current affairs writer and expert in government exam preparation, inspiring readers with insightful articles and guiding aspirants with his expertise.

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