LETTERS
Mar 10, 2022
3 minutes
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Celestial nav on a flat earth?
In [Andy Schell’s] 2019 article ‘Back to basics: Offshore sailing by celestial navigation alone’ [he] wrote, “In simplified terms, when we take a sextant altitude of the sun we’re creating a right angle triangle between it, the earth’s surface at the GP, and ourselves. Grade school geometry tells us that the two angles in a right-angled triangle must equal 90°.”
Technically this is incorrect. The light
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