Refuting the Flat-Earth theory

[FlatAssembler]

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.

On a flat earth, two people in Cape Town and Melbourne, looking out at the same time (8hrs apart on their clocks), facing due south, near the horizon. Can they see the same stuff in the sky (stars being near or far is completely irrelevant when you are looking in completely different directions)? Nope, because they are looking at 120° different directions. Basic trigonometry of a circle: Two rays going outside from the center (= due north in the flat earth model) do not meet (only after crossing the entire universe once maybe).
Now call Cape Town and Melbourne and ask them what they see.


But thats not the only thing blatantly not in accordance with basic observations regarding flat earth. My suspicion is that some trolls started this, and now countless idiots got sucked in.

Once again, I don't understand the argument you are making. According to the Round Earth Theory, people from Cape Town and Melburne looking at the sky at the same time will not see exactly the same stars. Stars rise and set during the night. If you move towards the east, some stars that have already set where you were will be visible.