How did ancient people know that the earth was round?
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Watch a ship sail out to sea. Once it get to the horizon, it starts to drop out of sight, until it’s completely gone. The simplest explanation is that the Earth is some sort of round.
Look at the shadow of the Earth on the Moon during a lunar eclipse. The Earth seems to have a circular silhouette — every time. Again, the simplest explanation is that the Earth is close to spherical.
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