How did Eratosthenes calculate the circumference of the Earth

>> YOUR LINK HERE: ___ http://youtube.com/watch?v=Mw30CgaXiQw

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 and his brain. • -------------------------------------------------- • Follow BI Video on Twitter: http://bit.ly/1oS68Zs • Follow BI on Facebook: http://bit.ly/1W9Lk0n • Read more: http://www.businessinsider.com/ • -------------------------------------------------- • Business Insider is the fastest growing business news site in the US. Our mission: to tell you all you need to know about the big world around you. The BI Video team focuses on technology, strategy and science with an emphasis on unique storytelling and data that appeals to the next generation of leaders – the digital generation.

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