Just a thought experiment, let’s say the earth is flat, looks like many professionals would know, including
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Pilots/ATC/sea captain
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Land surveyor and civil engineers
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Astronomers and Geologists, at least the one dealing with experimental data
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Militaries, at least radar operator and artillery
Just these categories are already a lot of persons, I assume I miss a lot of others. So how many person does it make in total ? 10 % of the population ?
But if the flat earth goes on, what can be assumed to be, infinitely past the ice wall (since no one really gives an answer for what’s past there), think of how big maps would be! They would have to sell giant maps and make a fortune.