National Pi Day celebrates Pi, a mathematical concept and a number that never ends....at least no one and no computer has found the end yet. Often, we round it off to 3.14. If you are a mathematician, this is your day. For National Pi Day is a celebration of mathematics. And, more specifically.... it celebrates "Pi".
Today is the birthday physicist Albert Einstein. Einstein was born on March 14, 1879. The date is also represented as 3.14. We strongly suspect some combination of these two facts is why someone created the day on March 14th. However, "Pi" was around long before Albert Einstein was born.
A Little Pi Day Trivia: On Pi Day in 2004, Daniel Tammet recited 22,514 to digits.