No. There’s lots of observational evidence/proof that the Earth is a sphere. For instance the ancient Greeks showed that the surface of the Earth was curved by looking at how the length of the shadow cast by a stick changes with location. The constellations of stars also look different from different points on the Earth’s surface. And astronauts have seen the curvature of the Earth from space.
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johnmidgley commented on :
The earth is not flat. If it was, at night you would be able to see the lights on the Shard in London from Edinburgh.