Actual experiment which does not detect any curvature.

Actual experiment which does not detect any curvature. Given the official diameter of the "sphere" and the calculation formula, it has to be measurable, phisycal, observable curvature - but such was not measured. This is not a single experiment - in the next days I will post such experiments from all over the world, all of them with same result - no curvature. Research flat earth.