Speaker for June GM

31st May 2022
By Bob Fuller
Chris Matthew from Western Sydney Uni will be talking on the subject: "More accurately than Others: Eratosthenes and the Circumference of the Earth". SYNOPSIS: In the third century BC, the Greek Polymath, Eratosthenes – then chief librarian of the Great Library of Alexandria – attempted to calculate the circumference of the Earth based upon observations of the Sun, the shadows cast by the solar light, and the distance between two locations in Egypt.

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