From this year onwards, in addition to celebrating **Pi Day** on March 14th, I am going to celebrate **Pi ***Approximation* Day on July 22nd (22/7) as well. I can really use an additional day of celebration for my favorite mathematical constant!

By the way, here’s an interesting approximation of π: A nano-century is approximately π seconds long. In other words, if you divide the number of seconds in a century by one billion (nano = 1 billionth), you’ll get a result that’s close to π:

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The comic is from *Dinosaur Comic*.

**Previous posts involving π:** *3.14*, *A Sanskrit Mnemonic for π, Happy Pi Day!, A Mathematical Conundrum.*

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