How did we discover that the Earth is round?
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About 3000 years ago people believed that the Earth was flat. But people wondered why ships disappeared at the horizon Sailors too returned from journeys and were proof that ships did not fall off the edge of the Earth. The simplest explanation was: that the Earth must be round. The final proof came in the year 1522 after the expedition of Ferdinand Magellan, who was the first to sail around the Earth.