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What field do you work in, and how many digits of pi do you use? (self.asklemmy)

submitted 8 months ago by nycki to c/[email protected]

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This article says that NASA uses 15 digits after the decimal point, which I'm counting as 16 in total, since that's how we count significant digits in scientific notation. If you round pi to 3, that's one significant digit, and if you round it to 1, that's zero digits.

I know that 22/7 is an extremely good approximation for pi, since it's written with 3 digits, but is accurate to almost 4 digits. Another good one is √10, which is accurate to a little over 2 digits.

I've heard that 'field engineers' used to use these approximations to save time when doing math by hand. But what field, exactly? Can anyone give examples of fields that use fewer than 16 digits? In the spirit of something like xkcd: Purity, could you rank different sciences by how many digits of pi they require?

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[–] [email protected] 77 points 8 months ago (3 children)

I'm Australian. I normally manage a pie with 5 digits, unless it's particularly crumbly or runny, in which case I will sometimes use 10!

[–] [email protected] 16 points 8 months ago (1 children)

I find this comment absolutely hilarious.

I recognize your profile pic from a comment months back that was also a short, deadpan reinterpretation of the question that I found hilarious. I can't for the life of me remember what it was of course.

Thanks for making me laugh!

[–] [email protected] 3 points 8 months ago

I'll be here all year :P

[–] [email protected] 11 points 8 months ago

3628800?? thats a lot!

[–] [email protected] 7 points 8 months ago (1 children)

I bet all the Americans reading this are now imagining you eating some gooey dessert like key lime pie or pumpkin pie with your hands.

[–] [email protected] 3 points 8 months ago (2 children)

If it's anything like the little island off it's east coast it will be steak and black pepper of a chicken korma pie

[–] [email protected] 2 points 8 months ago (1 children)

Steak and black pepper pie, now that's what I'm talking about!