Carl Sagan on ancient Greek mathematician Eratosthenes.
Carl Sagan on ancient Greek mathematician Eratosthenes.
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41K views · 1.4K reactions | A wonderful clip of humanist and cosmologist, Carl Sagan, on the Greek Polymath, Eratosthenes, and his endeavour to measure the circumference of the Earth. In doing so, Eratosthenes proves the Earth's curvature, over 2200 years ago. | Humanists UK | Facebook
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28K views · 237 reactions | This video shows Carl Sagan explaining Eratosthenes' Experiment, in which he was able to estimate with precision the size of planet Earth about 23 centuries ago. Credit: Cosmos. | Ceres Science | Facebook
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