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We are now World History Encyclopedia to better reflect the breadth of our non-profit organization's mission. Learn More
An illustration showing Greek scientist Eratosthenes' method for calculating the circumference of the Earth. By measuring the angle of a shadow in one location (Alexandria) and comparing at the same time with a second point (Syene) where the sun was directly overhead and created no shadow and by calculating the distance between these two points, Eratosthenes was able to calculate the curvature of the earth between the two points and extrapolate that figure to calculate the circumference of the earth. He arrived at a figure only 15% inaccurate and that probably due to the unreliable distance figure between the two points rather than any error in his mathematics.
Based on Wikipedia content that has been reviewed, edited, and republished.
Original image by Lookang. Uploaded by Mark Cartwright, published on 05 April 2013 under the following license: Creative Commons Attribution-ShareAlike. This license lets others remix, tweak, and build upon your work even for commercial reasons, as long as they credit you and license their new creations under the identical terms. Please note that content linked from this page may have different licensing terms.
Lookang, . (2013, April 05). Eratosthenes' Calculation of the Earth's Circumference s. World History Encyclopedia. Retrieved from https://www.ancient.eu/image/1133/
Lookang, . "Eratosthenes' Calculation of the Earth's Circumference s." World History Encyclopedia. Last modified April 05, 2013. https://www.ancient.eu/image/1133/.
Lookang, . "Eratosthenes' Calculation of the Earth's Circumference s." World History Encyclopedia. World History Encyclopedia, 05 Apr 2013. Web. 07 Mar 2021.
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