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→External links: HTTP --> HTTPS [#1], replaced: http://www.britannica.com → https://www.britannica.com
== External links ==
== External links ==
*[http://www.britannica.com/EBchecked/topic/191064/Eratosthenes-of-Cyrene Eratosthenes]
*[https://www.britannica.com/EBchecked/topic/191064/Eratosthenes-of-Cyrene Eratosthenes]
*[http://www.windows.ucar.edu/tour/link=/people/ancient_epoch/eratosthenes.html Eratosthenes]
*[http://www.windows.ucar.edu/tour/link=/people/ancient_epoch/eratosthenes.html Eratosthenes]
*[http://www.realclearscience.com/blog/2016/02/is_the_earth_flat_test_it_for_yourself.html Is the Earth Flat? Test It for Yourself]. This link describes a modern version of the Eratosthenes proof.
*[http://www.realclearscience.com/blog/2016/02/is_the_earth_flat_test_it_for_yourself.html Is the Earth Flat? Test It for Yourself]. This link describes a modern version of the Eratosthenes proof.