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EARTH, A PLANET? WHEN!?
When the Earth was first proven as a planet cannot be set to one date. The Greeks in the 6th century BC had discussed how the Earth was a sphere, but how large? Eratosthenes in about 240 BC discovered that it was 250,000 stadia, or about 40,000 km (25,000 miles) by measuring shadows at noon in Syene and Alexandria. From the angle and distances, he used trigonometry to determine the size. It was speculated until the 7th century AD, when the flat earth theory finally disappeared. However, it took until Columbus in 1492 proved with hard evidence that the earth was round, and finally the way to India (the Philapines), by Magellan about 1521. Surprisingly, he knew that.
David Schaedler
November 2, 2015
Sources: Wikipedia, Google Images, Getty Images, #Magellan