Flat Earth - Nautical miles? You're Going to Need C For That
First, the video you see open in my other tab is "Dougie McFlattie Proves The Globe," by @Q Branch.
https://www.youtube.com/watch?v=kFOyZgDV1iE
I was watching that when they quoted 1 degree of latitude per 69 [statute] miles, and then wondered why they hadn't used nautical miles, and then wondered what a NM would even be for a flat Earther.
Flat Earthers have been trying to claim you can only use a sextant if the Earth is flat because they can't understand tangents in 3 dimensions.
So, they parrot 1 degree of latitude being 60 nautical miles.
But - wait a second. Nautical miles?
You're going to need C for that.
Source
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"Back to basics: Offshore sailing by celestial navigation alone," Andy Schell, Yachting World, June 18, 2019
https://www.yachtingworld.com/voyages/celestial-navigation-121763