# A question about Sun disk deformation

Suppose the Sun rises and due to refraction the Sun's disc gets deformed. Let the center of the sun be $$O$$ and $$OL$$, $$OR$$, $$OT$$, $$OB$$ be the distances from the center of the disc to the edges in the direction $$L$$eft, $$R$$ight, $$T$$op and $$B$$ottom ($$L$$, $$R$$, $$T$$, $$B$$ are the farthest points from the center of the disc to their direction due to the deformation of the solar disk). How to find which of the 4 distances is bigger and which is smaller?