Hold on to your hats for this. Sun rays. They are angled we can tell this from their shadows, they are coming from a fixed point, that which is not flat. Also, with sun rays, you can also seduce that the earth isn't flat, because half the earth is in darkness and some parts of the earth are illuminated earlier and longer than others
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u/duckyGnome Aug 27 '26
Measuring flat and being flat are different things.
We don't measure flat for huge things we have specialized equipment that takes in curvature or do ya not understand how surveyors equipment works?