Monday, April 23, 2012 6:34:13 AM
They debunk some myths and then end with one? Columbus never got to the land now known as America; ... Amerigo Vespucci was the one to discover it... and yes after the Vikings.
Thursday, April 19, 2012 7:52:34 AM
Yes, Earth isn't actually a sphere. The ancient Greek methodology and theory was correct, but their technology didn`t allow precise enough measurements to differentiate between a sphere and a slightly oblate spheroid.
Thursday, April 19, 2012 7:48:23 AM
Just in case anyone cares:
The first known *formal* proof that the Earth is round dates back to the early days of ancient Greece, long before Eratosthenes calculated its size. The formal proof is simple with hindsight. Observations of the shadow cast on the moon by the Earth showed that they are always the curve of a circle. The only object that casts a circular shadow from every angle is a sphere. Therefore the Earth must be a sphere.
But as FredSpudman points out, it was known long before then that the Earth wasn't flat. The lunar shadow thing was the first formal proof that it`s spherical, not the first knowledge that it wasn`t flat.
Thursday, April 19, 2012 3:59:20 AM
ShudBWorking, even the not very bright could fathom that the Earth wasn't flat back in the day. At sea, you`d see the mast of a ship first because of the curvature of the Earth.