National Pi Day celebrates Pi, a mathematical concept and a number that never ends....at least no one 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.
From here
So, it's the day of Pi, because March 14 = 3/14 = 3.14 = Pie. Enjoy eating!
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