Abu Ali al Hasan al Marrakushi

Abu Ali al-Hassan al-Marrakushi (fl. 1281/2) was a Moroccan astronomer and mathematician. He was especially important in the field of trigonometry. He described more than 240 stars. He is the author of a very large compendium on spherical astronomy and astronomical instruments (sundials, astrolabes) entitled ami’ al-mabadi' wa'l-ghayat. He wrote this treatise in Cairo. It was translated into French by J. J. Sedillot in 1834. He also the author of Kitab al-Kotua al-Makhrutia (conic sections).