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4
votes
1answer
606 views

How did Columbus calculate the size of the Earth?

Eratosthenes' calculations of the size of the Earth were very precise and very accepted during Columbus' time. Still, Columbus was convinced that the world was significatively smaller and that getting ...
27
votes
4answers
15k views

Why is Christopher Columbus credited for “discovering” America?

Even if we ignore the millions of native Americans who lived in the continent before Columbus "discovered" it, even if we ignore other civilizations (eg: Polynesians, Phoenicians, Chinese, Arabs, ...