The popular astronomer Carl Sagan and Narrator presents the many incredible discoveries made by the ancient Greek mathematician Eratosthenes. In this clip from the science series “Cosmos”, the Sagan shows us how Eratosthenes calculated the circumference of the Earth.

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1. Akis says:

   11/12/2013 at 22:53

   Comment as tells the Narrator left many ordinary citizens but also scientists of the time indifferent, did a mind like Eratosthenes to find and the sphericity of the Earth but also the diameter of. Such minds are presented every hundred years.

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2. dimitris81 says:

   11/12/2013 at 01:37

   I am surprised that we expect it to understand that the earth is spherical sfairiki..I detected by observing the sky. However odografous they had to measure distances The shows some inventions of the ancient Greeks in 53lepto the link below https://www.youtube.com/watch?v=mKk2U0WMcVc

   

   

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