Pi Day is observed on on March 14  (3/14 in the month/day format) since 3, 1, and 4 are the first three significant digits of π.  Pie approximation day is observed on July 22 (22/7, an approximation of π).

History of Pie and Pie Approximation day

Pi (π) was known and used ancient times approximated for almost 4000 years.  The ancient Babylonians also calculated the area of the circle by taking three times the square of its radius which gave the value of pi equals to three. Archimedes of Syracuse (287–212 BC), one of the greatest mathematicians of the ancient world was the first person to do the calculation of π. Archimedes tried to show that the value π is between 3 1/7 and 3 10/71.

Pi Approximation day is a observed annually  to celebrate the usage of the mathematical constant π (pi). Pie day is observed on March 14 and Pi Approximation Day is observed on July 22. Pie day was founded by Larry Shaw in the year 1988. On November 2019 United Nations designated Pi day as the International Day of Mathematics.

Pi Approximation Day 2023 Significance

Following are few important facts about Pi

• The number π pi) is a mathematical constant.
• It is defined  as the ratio of a circle’s circumference to its diameter
• It is approximately equal to 3.14159.
• It is also referred to as Archimedes’ constant.
• Fractions such as 22/7 are commonly used to approximate it.
• Its decimal representation never ends and never settles into a permanently repeating pattern.
• It is known that π is a transcendental number:
• There is no zero in the first 31 digits of Pi
• The Welsh mathematician William Jones began using the symbol for pi in 1706.