**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.

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## 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.