On 1/25/25 12:41, dwight via cctalk wrote: > >> A simple home experiment: >> >> Find two points, such a hill/mountain-tops that are visible from each >> other, but 10 or 20 miles, at least apart east/west.. >> > This is not sufficient to prove the earth is spherical. This method was used > to calculate the diameter of the earth, already knowing that it was a sphere > and the sun was very far away. To prove it was not flat, one has to use 3 > locations. Using just two only helps to prove the stupid flat earther's > thought that the sun was much closer to the flat earth. 3 locations prove > that it can't be flat because the angle changes too much over distance. It > can be done in any direction but is easier to do North to South because time > of day only needs to be at high noon and distance known.
One need only watch a ship approaching shore from any direction to notice that the horizon is curved.
