>>3113948Hi. I am the Paris gun from WW1. I shot the first man made objects into orbit over 100 years ago.
In order to calculate where my shells would land - my users had to use the curvature of the earth in their calculations to hit Paris from over a 60 mile range.
If the earth was flat I would not have worked properly.
Also a lot of shell operators of the big guns from WW1 had to use the curvature of the earth in their calculations.
