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Vasco da Gama led the first around-the-world expedition, but NOT to prove that the world was round. That had already been widely known for well over 1,500 years. The ancient Greeks had even very accurately calculated the exact size of planet Earth and they even had worked out (to the exact number of degrees) the slight tilt that the axis of our planet has.

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Q: Who led a three-year expedition that proved the earth was round?
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He proved that the world was in fact round, not flat. He aldo proved that it was larger than everyone thought it was.


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