Pi Day / International Day of Mathematics
14 March 2026 — I roll on forever, just like the digits after 3.14! 🥧
Pi (π) is the ratio of a circle's circumference to its diameter. It is approximately 3.14159 and has infinitely many decimal digits that never fall into a repeating pattern, which makes it an irrational number (one that cannot be written as a simple fraction). The Greek letter π came to be used for this number in the 18th century and was popularized by Leonhard Euler. Pi Day is held on 14 March because the date is written 3/14 in the American style. The first celebration was organized in 1988 at the Exploratorium science museum in San Francisco by physicist Larry Shaw. In 2019, UNESCO's General Conference proclaimed 14 March the International Day of Mathematics. People mark it with puzzles, digit-recitation contests and pies, since pie sounds just like pi. The date is also Albert Einstein's birthday. The link to the sky is direct: π is essential for calculating orbits, circles and angles in astronomy.
Flying across the sky: An ethereal, bluish-silver figure of the Greek letter pi made of bright dots and connecting lines, like a constellation, with a smiling face of stars
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