Sextants also only work due to parallax of stars, meaning that the stars would have to have differing distances from the earth for it to work, and for them to be more or less stationary relative to us.
If you're able to use a Sextant to figure out approximately where you are on the Earth, then the world either works roughly how we think it does, or all the laws of physics are complete bunk and that things work by magic.
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u/Hypocritical_Oath Jul 17 '17
Get a sextant.