Here is autocad depicting the curvature of a ball with earths dimensions. 600.16 feet @ 30 miles away. Take note how fast things drop off as your distance increases. @80 miles it is over 4000 ft in drop.
We aren't even having a debate anymore because there is nothing to debate other than the fact you are in denial. Take a few days and let it all sink in. It happens to all that start looking into the topic.