it isnt an experiment AT ALL.
its an alternative explanation that claims atmospheric refraction doesn't exist and observed star position is the true position
and ties itself in knots trying to make a dome over a flat earth fit the observable data.
because the data shows that the observed occultation of star S over mountan A for two observers at different elevations and distances is NOT explained by simple trigonometry on a flat surface.
it matches what you'd expect to find on a curved surface.
and if theres no refraction or terrestrial curvature, what causes the difference?
apparently they think we should just adjust the dome geometry or something....
theyre understandably silent on this point and only provide single observer measurements.
anyway
its not an experiment that tests a hypothesis.
they just say "refraction doesn't exist and observed star positions are the true positions."