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 ?
The guards that patrol the ice wall.
Entirety of NASA. Entirety of NOAA. Meteorologists. Cartographers. Everyone who works on Google Earth. Every engineer who works on satellites, rockets, and planes. Physicists.
However, I do think 10% is probably too high an estimate. While these are a lot of people in a lot of areas, they represent pretty small demographics each.