Original sentence: Copernicus at one point used the same model as al-Shatir for removing equants; it temains controversial whether Copernicus was directly incluenced by al-Shatir's work.Ibn al-Shatir proposed a system that was only approximately geocentric, rather than exactly so, having demonstrated trigonometrically that the Earth was not the exact center of the universe
Edited sentence: He received the credit for the discovery even until today.Ibn Shater hypothesized that the earth was not the center of the universe and proved it by trigonometric means.Later on, Copernicus restated this theory to the Europeans.Some Westerners call the influence of Ibn al-Shatir's work on Copernicus "controversial"