Refuting the Flat-Earth theory

[FlatAssembler]

What i am talking about is basic trigonometry.
If Earth is a globe vs Earth being a disk is fundamentally different, particularly near the south pole. Of course most people focus on the norhtern hemisphere, because an overwhelming amjority lives there.

Yet, based on osservations, the glaring difference in the resulting geometry when looking at the sky (between sitting on the outer part of the disc vs sitting on the bottom of a ball) will tell you if the Earth is a globe or a disc. But i am certain that flat earthers will just ignore this like anything else.

I know Flat Assembler is not a flat earther, i was just trying to show him how to lead one.....one that is not either a troll or completely ignorant.

I don't understand your argument. If the Earth were flat:
1) If the stars are very far away, everybody on Earth would see the same stars. Constellations wouldn't shift at all.
2) If the stars were relatively close to us, then the constellations would indeed shift. But the constellations would have different shapes depending on the place we are looking at them. There would be perspective distortions, and, unless we assume all the stars in the same constellation were equally far away from us, there would be parallaxes.
Either way, it would be trivial to tell that the Earth is not round from the observations from the northern hemisphere alone.