Today is Pi Day! No, it’s not a day to celebrate pies. You already missed National Pie Day on January 23. March 14, 2017 is a holiday to celebrate the mathematical constant Pi, represented by the Greek letter π. The first three digits are 3.14, just like today’s date.
The one little symbol represents the ratio of a circle’s circumference to its diameter. It is an irrational number, meaning that it can never be put in an exact fraction and never really ends.
Pi Day was created in 1988 by physicist Larry Shaw. It’s since become an international day, celebrated around the world.
March 14 is also Albert Einstein’s birthday. Here’s a look at the special holiday.
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