Eratosthenes' proved Earth’s curve with a shadow #ancient
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YouTubeCurious Club TV
Eratosthenes' proved Earth’s curve with a shadow #ancient
Carl Sagan explained the genius of the ancient Greek mathematician Eratosthenes by illustrating how Eratosthenes disproved the flat Earth idea through a simple but brilliant experiment over 2,200 years ago. Eratosthenes learned that in Syene (modern Aswan, Egypt), at noon on the summer solstice, vertical objects cast no shadow because the sun ...
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