From this distant vantage point, the Earth might not seem of any particular interest. But for us, it's different. Consider again at t...

The legendary Carl Sagan brilliantly demonstrates how Eratosthenes proved a spherical Earth. Hard to believe that some people still deny ...

Carl Sagan's Cosmos: A Personal Voyage

A most simple deduction made around 200 bc by the Astronomer Eratosthenes. A Globular spheroid is our home