xkcd

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submitted 2 weeks ago by [email protected] to c/[email protected]

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It works because a nautical mile is based on a degree of latitude, and the Earth (e) is a circle.

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[–] [email protected] 7 points 2 weeks ago (1 children)

Fibonacci numbers are easier than ln(5) to calculate on the spot tho

[–] [email protected] 2 points 2 weeks ago

You're not wrong. The ln(5) trick is for when you have a scientific calculator but it doesn't have the conversion built in.