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Geotechnical Egineering News tagged with [earth circumference]

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How Greek Eratosthenes calculated earth circumference
Business Insider   31 October 2016   Greece   Europe  
Eratosthenes (source:thefamouspeople.com)
<p>In the mid-20th century we began launching satellites into space that would help us determine the exact circumference of the Earth: 40,030 km. But over 2000 years earlier, a man in Ancient Greece came up with nearly the exact same figure using just a stick ...