People have known the earth is round for a few millennia. I think since c350 BC.
One of the ways they knew about this was due to constellations. Aristotle proved the earth way round as he noticed that he could see different constellations from the equator then high in the northern hemisphere. The farther you go from the equator, the farther the ‘known’ constellations go towards the horizon, and are replaced by different stars. This would not have happened if the world was flat
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