Now Einstein would help the flat Earth theory? Truly absurd.
(((Einstein))) developed his whole Time Magazine career to bury the results of Michleson Morley aether drift experiments that showed that the Earth is not moving -- if anybody cannot already tell.
I doubt any of the flat Earther people here are for real.
Aristotle observed the parallel weave between art and nature, and that art often completes what nature does not finish, and nature finishes in its way what art abandons. This involves mathematics and logic both ways. Math and logic are themselves art and nature in different guises, and any circle that is complete in 3-D is a sphere.
And cosmic and terrestrial space both are naturally 3-D, mathematically, also having a constant and mysterious relation to infinity, again in 3-D, even like something "trinitarian", which relation is best expressed in circles and spheres. For which reason the Sun, Moon, and Earth are all perfect spheres.
Things do not change in relation to the infinite. They only change in relation to other things also in some proportion. In the way that things do not change in relation to the infinite, the Earth also is a sphere that is not moving, as all the honest empirical evidence clearly shows.