I decided to start working my way through the original Cosmos, to - TopicsExpress



          

I decided to start working my way through the original Cosmos, to see how it compares to the new one. In the first episode, Sagan describes how Eratosthenes determined the shape and size of the Earth, to a few percent, over 2200 years ago. I of course know this story, but I never get tired of hearing it. Its amazing that such a simple experiment yielded one of the most profound revelations about our world.
Posted on: Sat, 07 Jun 2014 16:24:34 +0000

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