Do you like pi? I’m not talking about fruit or custard in a round pastry shell like those made with apples, cherries, or lemon meringue.
I am talking about a mathematical constant that shows up almost everywhere in our understanding of the universe, symbolized by the Greek letter “π”. This is pronounced “pi.” It is the ratio of the diameter of a circle to its circumference, or more plainly, the ratio of how tall a circle is to the distance traveled when it rolled exactly once around.
Every year, Pi Day is observed on 3/14, since 3.14 are the first three digits of pi. But twice today, 3/14/2015, we’ll get to see the clock hit the first 10 digits of pi — 3.141592653 — an occurrence that won’t happen again for another 100 years.
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