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# Happy Pi Day 2013!

In honor of Pi Day, March 14, here are Math Dude's two fun facts about pi!

By
Jason Marshall, PhD,
March 14, 2013

Page 1 of 2

It's March 14, which means it's pi day! Yeah, party time!

So, what's all the fuss about? Well, every March 14 people around the world (although mostly just on the Internet) join together to celebrate the deliciousness of everybody’s favorite mathematical constant, pi.

Why March 14? Because pi is approximately equal to 3.14...hence 3/14...hence March 14. To celebrate, here are 2 fun facts about pi for you to share at all those pi parties you’re going to tonight:

## Pi Fun Fact #1

The first fun fact is also quite handy. It’s used by astronomers (myself included) all the time to make estimates. The trick is to know that there are roughly pi*10-million seconds in a year. In other words, the number 3.14 times 10-million is pretty close to the number of seconds that you age each and every trip around the Sun. Of course, that's not the precise number. If you work it out, you’ll find that there are actually 31,536,000 seconds in a year. But pi*10-million is usually good enough…and it’s certainly a lot easier to remember.

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