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Eratosthenes's Measure of the Earth's Circumference

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Uploaded by on Apr 21, 2010

http://demonstrations.wolfram.com/EratosthenessMeasureOfTheEarthsCircumference

The Wolfram Demonstrations Project contains thousands of free interactive visualizations, with new entries added daily.

Eratosthenes measured the circumference of Earth around 240 BC, based on the fact that the Sun appears in the zenith at noon on the summer solstice, in Syene (modern Aswan). At the same time, in Alexandria, the angle of the shadow of a post was slightly...

Contributed by: Enrique Zeleny

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