Carl Sagan explains how the Greeks worked out the earth was round, and it's exact circumference using a couple of sticks, over 2,000 years ago.
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@UniverCurious That’s the equivalent to 300km a month. So it would have taken the man he hired at least 3months to walk that distance.
@UniverCurious I mean maybe a bit less depending on how many km a day he walked. But over all a lot of walking 🚶