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**An Earthly Approximation of Pi:**A geeky math and science teacher sets out to make an approximation of Pi on Pi Day.

Posted by Douglas, Mar 14, 2010. 2674 views. ID = 3324

Posted by Douglas, Mar 14, 2010. 2674 views. ID = 3324

## An Earthly Approximation of PiPosted by Douglas, Mar 14, 2010. 2674 views. ID = 3324This post was written in 13 minutes. |

This post has been awarded 20 stars by 4 readers. |

It occurred to me last evening that if one happens to know the length of a one degree arc of the equator of planet earth, as well as the angular speed of planet earth...

Yes, I know, the obvious question is,

Can I continue now? Please?

Thank you. As I was saying, if you know the length of a one degree arc of the equator (L), the angular speed of earth (S), the number of hours in a day (T), and the radius of the earth (R), you can come up with a very reasonable approximation for the number PI as follows:

PI = LST/2R.

I tried out this magnificent formula last night:

PI = 69.1709 x 15 x 24 / 7928 = 3.14175, which is mighty close to the actual value.

I woke up this morning and tried it again, in honor of Pi Day.

PI = 69.1709 x 15 x 23 / 7928 = 3.011.

Which leads us, of course, to the inevitable conclusion that Pi Day should

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This post has been awarded 20 stars by 4 readers. | |

This post is part of a writing prompt: It's Pi Day! | |

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