The "Great Circle" is just the light ray curving! #FlatEarth

http://flatearthtime.ivo17.com/lightcalc.html ">https://flatearthtime.ivo17.com/lightcalc... Here is a simple light curvature calculator! Notice how at the Equator, the results are the same as with the Globe, since the Equator is the only true distance on the Globe!