Flat erfers do make some interdasting points tho.
Distance Curvature
1 mile 0.00013 miles = 0.67 feet
2 miles 0.00051 miles = 2.67 feet
5 miles 0.00316 miles = 16.67 feet
10 miles 0.01263 miles = 66.69 feet
20 miles 0.05052 miles = 266.75 feet
50 miles 0.31575 miles = 1667.17 feet
100 miles 1.26296 miles = 6668.41 feet
200 miles 5.05102 miles = 26669.37 feet
500 miles 31.5336 miles = 166497.53 feet
1000 miles 125.632 miles = 663337.65 feet
https://earthcurvature.com