Pi Approximation Day falls on July 22 (written as 22/7 in the day/month date format). It commemorates the common approximation of the mathematical constant π as 22⁄7, which dates back to Archimedes ...

On π-day, one mathematician explores our fascination with pi and asks why we obsessively compute its digits. Pi Day, the International Day of Mathematics, is celebrated on 14 March, due to the date's ...

It's Pi Day! And in honor of this year's celebration I decided to do a bit of historical research. While π—the ratio between a circle's circumference and its diameter—has long been known and ...

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 ...

Pi Approximation Day 2025: Pi is a special number in mathematics. It shows the relationship between a circle’s circumference (the distance around the circle) and its diameter (the distance across the ...

JACKSONVILLE, Fla. – Tuesday is March 14, also known as National Pi Day. The celebration is based on the first three digits of pi, 3.14. So what exactly is pi, often symbolized as the Greek letter π?

Whether using 3.141 or the record-holding 314 trillion–digit calculation announced in December 2025 by Storage Review Lab director Kevin O'Brien, every representation of π is still an approximation.