But consider a flat Earth and a low small sun directly over the well. This will
yield exactly Eratosthenes' result. The key here, which I've never seen
mentioned in any books for children, is that the Greeks had to have a very good
set of reasons for thinking the Earth round and the sun large
Here is a link to Alan's talk, his reference to Eratostenes starts at around
51:50.
Alan, do you still have a copy of the presentation?
Stephen
On Thu, Sep 29, 2011 at 12:18 AM, Alan Kay alan.n...@yahoo.com wrote:
But consider a flat Earth and a low small sun directly over the well. This
