Today is around the 4.5 billionth Pi Day that Earth has witnessed. That long history is nothing compared to the infinity of pi itself, writes FiveThirtyEight. Pi, or the Greek letter π, is a mathematical constant equal to the ratio of a circle’s circumference to its diameter — C/d. It is in every circle, and equals approximately 3.14. Therefore, we celebrate Pi Day on March 14 (3/14) every year. But while most of us can leave pi at 3.14, the number actually continues forever. And for a millennia, humanity has been chipping away at pi’s unending amount of digits. People have been interested in the number for basically as long as we’ve known its existed. The ancient Egyptians knew that pi was something like 3.1, according to FiveThirtyEight. Then, about a millennium or so later, an estime of pi showed up in the Bible. Archimedes, the greatest mathematician of antiquity, got as far as 3.141 by around 250 B.C. Meanwhile, Archimedes approached his calculation of pi geometrically, by putting a circle between two straight-edged regular polygons. Slowly, as computer got faster and memory became more available, digits of pi became easier to discover. The current record now stands at over 22 trillion digits.
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