#3023: The Maritime Approximation
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[Equation inside a frame with a footnote:]
π mph = e knots*
*Correct to <0.5%
[Caption below the panel:]
The sailor's version of eiπ=−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.