(In reply to discussion
I agree with Charlie on the discussion on apparent curvature of the earth.
My take is that the curvature would always be apparent in a perfect world. However, terrain and a non-uniform surface create enough restriction to sight that it is not apparent close to the ground.
Additionally, on the best weather days, visibility through the atmosphere is still limited to about 70 milesm hindering us land dwelling creatures.
I think that it requires moving above the majority of the atmosphere and weather to see the curvature. I estimate 4 to 5 km in altitude.
Posted by Leming
on 2006-01-29 17:36:51