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About 2200 years ago, Erathosthenes did an experiment which led him to believe that the earth is round. Even before that, Aristotle has given us two good arguments to make us believe that the earth is round. The notion that the earth is round is already existed hundreds of years BC. To be precise, it was long before the time of Jesus and the Prophet Muhammad.
How did Erathosthenes know that the earth was round? What are Aristotle's arguments?
In this video, I explain the history of astronomy, the history of how we view the universe and our position in the universe from the geocentric Ptolemy (Ptolemy) era, that the earth is the center of the universe and the sun surrounds it. Then Kepler, he shook when he knew that the orbital motion of the planets was not in the perfect form that he had believed, until the time of Newton, who explained gravity for the orbital motion of planets around the sun.
This video is based on my interpretation from the book Cosmos - Carl Sagan, it is highly recommended for you to read it right away!
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