Would any one help me understand how did the ancient Greeks managed to calculate the earth’s circumference using knowledge of the angle of elevation of the Sun. I wonder if they had any means of magnification such as lens. They did make some pretty accurate conclusions for the limited technology they used.(adsbygoogle = window.adsbygoogle || []).push({});

Another question: were the ancient Greeks the first to assume the earth was round rather then flat?

Thanks in advance

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# Ancient calculations and observations

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