Pi day fun.

The article focuses on Pi (π), the mathematical constant representing the ratio of a circle's circumference to its diameter, which begins with 3.14159 and continues infinitely without repetition. It outlines the historical progression of Pi's calculation, starting from ancient civilizations like the Babylonians and Egyptians, through significant contributions by mathematicians such as Archimedes, Ptolemy, and Madhava of Sangamagrama, who introduced innovative methods for estimating Pi. The article also highlights the evolution of technology in calculating Pi, culminating in a record of 300 trillion digits set in 2025, while noting that practical applications typically require far fewer digits, such as the 40 used by NASA for cosmic measurements. [Extracted from the article]