4 Answers

  1. Well, the first person to write down the conclusion about the shape of the Earth was Aristotle. And he relied on a fairly simple observation: whenever the Earth casts a shadow on the Moon, that shadow is round, no matter what time of year it is. The only geometric shape that can constantly cast a round shadow is a sphere, etc.

    After a couple of centuries, Erastophen was able to determine the circumference of this sphere quite accurately.

    And so yes, without any circumnavigation of the world, quite accessible evidence is enough.

  2. Initially, as usual, this idea occurred to the ancient Greeks. And it's not about traveling at all. The Greeks worshiped mathematics (much like today's physicists) and believed that everything in the world was arranged in harmony. And what is the most harmonious shape? It's a circle. So the Earth can only be round and nicked differently.

  3. Round-the-world travel speaks for itself. Travel in a circle, not in a ball. I've never heard of round-the-world travel)

    And yes, the Earth may well be round. But not spherical…

    1. Objects disappear over the horizon

    2. Space objects rotate too oddly for the Earth to be centered and stationary

    3. The sun, moon, and planets that could be seen back then were spherical.

    4. The sun sets on one side and rises on the other, but the illumination and darkening occur gradually, and not abruptly, as it would be in the case of a disk.

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