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How is it possible that a ship disappears after 20 Miles beyond the horizon if the earth is flat.
Are you a round earther??
Assuming excellent vision, you could distinguish an object 50 meters tall at a distance of 500km
However, for the average person with average sight, most ships would disappear before they are that far away
Keep in mind that color contrast might allow us to perceive smaller objects if they differ significantly from their background
None. Earth is an oblate spheroid. First of all you need to differ the terms of round and spheroid or elipsoid. From Eratosthenes to those flat Earthers... It is difficult to predict the exact direction of evolution in human intelligence. Some updates on geodesy, geodynamics and fundamental geometry could make you guys some favour.