It would require something I could verify myself. Without relying on any previous assumptions made by other people
GeoGuy Could you give us the equivalent of that to prove a flat earth?
You could go test the gravity of a large (or even a small one but you need more sensitive equipment the smaller and thus weaker gravity) object. You wouldn’t be able to quantify gravity by using something like a mountain because you wouldn’t know the mass of the mountain but it’s probably the biggest object you could find but even then you would have to have incredibly sensitive tools because even something as big as a mountain is tiny compared to the mass of Earth.
If you can prove Gravity (which it has been many, many times but you FE’ers deny the legitimacy of the evidence) then it will prove the Acceleration theory wrong and prove that a sphere is the natural shape of any large object (star, planet etc.) because gravity attracts objects together.
OR you could reenact the Cavendish experiment.
To be honest if you did go out and try to test gravity I think you would just look at the figures and say they are inconclusive because the gravity from small objects is so minuscule you’d just push to the side and say it is too small to be of any significance but you'd be horribly wrong.