#3023: The Maritime Approximation

XKCD comic, described below.
Transcript

[Equation inside a frame with a footnote:]

π mph = e knots*

*Correct to <0.5%

[Caption below the panel:]

The sailor's version of e=−1

(Sourced from explainxkcd.com)

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


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