this post was submitted on 27 Apr 2025
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Gone, reduced to atoms (lemmynsfw.com)
submitted 2 months ago by [email protected] to c/[email protected]
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[–] [email protected] 6 points 2 months ago (1 children)

but what if they're above water and we need to use nautical miles?

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

Those are actually much saner: 10 cables in a nautical mile and 100 fathoms in a cable.

[–] [email protected] 4 points 2 months ago* (last edited 2 months ago)

Both, nautical mile and metre are derived from earth's dimensions: One nautical mile is an arc ~~second~~ minute at the equator, i.e. its circumference is 360·60 NM = 21,600 NM. One metre originally was 1/40,000,000 of the circumference through the poles (or 1/10,000,000 of the distance from a pole to the equator).

Edit: Forgot three zeros in the definition of a metre.