Amateur astronomy (visual/photographic) supports/proves or falsifies/disproves/ destroys/annihilates any Earth model. You can have a disk or a plane, whatever. Unless you can explain the sky/heavens (what amateur astronomers see and photograph), it doesn't matter.
All celestial objects (e.g. stars) have celestial coordinates (declination and ascension) that match Earth coordinates - specifically
Declination = Latitude EXACTLY (See Explanation -
https://en.wikipedia.org/wiki/Declination). They are overhead based on their declination and the observer's latitude. A star with declination of 40° N will "draw" the 40° N latitude on Earth in 24 hrs. The N. Celestial Pole (90° N) is a single point over a single point N.Pole. The Celestial Equator (0°) is the largest circle (star trail) and is over the equator - not some "edge". The S. Celestial Pole (90° S) is a single point over a single point S.Pole (where is it exactly on any FE model?) (
https://www.theflatearthsociety.org/forum/index.php?topic=66457.0)
When looking at the S. Celestial Pole, everyone everywhere is facing due south (per declination/latitude) - just like when looking at the N.Celestial Pole, everyone is facing due north.
How do people south of the equator see the S. Celestial Pole rising higher and higher the farther south they go? Why is it a single point (that implies it is a single point on Earth per declination/latitude)? How can you see the stars BELOW it (draw a horizontal light through any image of it) when they are on the other side of the Earth 10,000+ mi behind you as you face south?
So arguing gravity or UA or other things are not even important if you can't get the sky right (i.e. the Earth model is wrong). On a FE FANTASY world, ANYTHING goes. You don't have to prove ANYTHING.
BTW, THAT is why the Earth is a sphere - because the sky WORKS.