# What is World Pi Day?

In many parts of the world, 14 March, which is the 14th day of March every year, is celebrated as the world "Pi Day" as well as the Medicine Day. Pi Day is March 14 because Pi, which is the ratio of the circumference of the circle to its diameter, is rounded to 3,14.

The mathematical constant Pi is usually abbreviated as 3,14 or 22/7 in calculations. The actual value of the number goes on like 3,141592653589793238462643383… forever and does not have any repeating patterns.

Pi number, which is of great importance in sciences such as mathematics, geometry and physics, especially in the calculation of the circumference and area of ​​the circle, is also referred to as the Ludolph number or Archimedes Constant in some sources.

Symbol Pi, the 16th letter of the Greek alphabet. This letter is also the first letter of the Greek word “perimetier” which means circle (circle). The symbol pi (π) was introduced by William Jones in 1706. However, the symbol became popular in 1737 when it was used by the famous Swiss mathematician and physicist Leonhard Euler.

Pi Day, which was first celebrated in 12 by a famous physicist Larry Shaw at the San Francisco Exploratorium, has been celebrated in Turkey since 2009, when the US House of Representatives declared March 14, 2009 as National Pi Day on March 1988, 2007.

## How is the pi number calculated?

Austrian astronomer Christoph Grienberger succeeded in calculating the 1630 decimal digits of pi with a similar method in 38. The value Grienberger has achieved has the title of being the most precise value achieved by human effort. In the process, mathematicians came up with many different mathematical series that would accurately calculate large numbers of decimal places.

One of the simplest series that can be used to calculate the pi number is the Gregory-Leibniz series. While not very efficient, this series will accurately reproduce pi to five decimal places per step. The series is as follows: π = (4/1) – (4/3) + (4/5) – (4/7) + (4/9) – (4/11) + (4/13) – (4 /15) ….

The Nilakantha Series is another infinite series for calculating pi which is quite easy to understand. It approximates pi much faster than the Leibniz formula, albeit a bit more complex.

Fabrice Bellard found the first 2010 digits of the number using the Chudnovsky algorithm in 2.699.999.990.000. Archimedes calculated it as a number between 3 exactly 1/7 and 3 exactly 10/71. The Egyptians used it as 3,1605, the Babylonians 3.1/8, Ptolemy 3,14166. The Italian Lazzarini was trading at 3,1415926 and the Fibonacci at 3.141818.

## How Many Digits of Pi Do We Know?

In 1765, a German mathematician named Johann Lambert proved that π is an irrational number. That is, it could not be expressed exactly as a fraction (the ratio of two integers). This is what it means. No matter how much this number is extended, no decimal expression can equal it. This was one of the things that fascinated mathematicians. We had a simple ratio, but it was not possible to find the equivalent. Trying to calculate an accurate value for this never-ending transcendent number has been one of the great themes throughout the history of mathematics.

Pi day is also the birthday of the famous physicist Albert Einstein.

📩 14/03/2022 20:51