The Greeks discovered that the earth is round by observing lunar eclipses (i.e. when the earth blocks the sun from the moon, casting its round shadow on the moon's surface).
I've been doing some searches on the net... and all sorts of names came up. Marco Polo, Columbus, Alexander, Archimedes, Aristotle, the Greeks, Magellan... O_o Some suggested the theory, some tried to prove it, some supported it, blah blah blah. But who actually did what... no idea. -_-" The Greeks sound like a possibility though.
Well, that is a hard thing to find, because there are so many documents stating that finding in many different times. However, I'm inclined to say that the Greeks were the first to actualy document it. They had all the knowledge to do so...
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Galileo discovered that the earth and the solar system turned around the sun, not the planets turning around the earth.
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However, I'm inclined to say that the Greeks were the first to actualy document it. They had all the knowledge to do so...