What’s Pi Day all about? Math, science, pies and more

A freshly decorated Key Lime pie rests on a counter in a busy bakery kitchen at Michele’s Pies, Wednesday, March 13, 2024, in Norwalk, Conn. Math enthusiasts and bakers celebrate Pi Day on March 14 or 3/14, the first three digits of a mathematical constant with many practical uses. Around the world many people will mark the day with a slice of sweet or savory pie. (AP Photo/John Minchillo)

College students, rocket scientists and math enthusiasts around the world are celebrating Pi Day. The holiday is on Thursday, March 14 since 3/14 correlates to the first three digits of the infinite number. It’s also Albert Einstein’s birthday, making the pie eaten at Pi Day gatherings all the sweeter. Pi is a mathematical constant that expresses the ratio of a circle’s circumference to its diameter. It is part of many formulas useful in physics, astronomy, engineering and other fields, dating back thousands of years to ancient Egypt and Babylon.