👉 The ellipsometer is a device used in astronomy and astrophysics to measure the position of an ellipse. It consists of two telescopes, one at each end of an optical path through which the light from the sun passes. The light from the sun is refracted by the lenses at the ends of the paths, causing them to bend slightly. These bends are used to calculate the angle that the light makes with the horizon when it enters the eye.
