Abu Ali al-Hasan al-Marrakushi

Abu Ali al-Hassan al-Marrakushi (Arabic: ابو علي الحسن المراكشي) (late 13th century) was a Moroccan astronomer and mathematician. He was especially important in the field of trigonometry and practical astronomy. He is the author of a voluminous treatise on spherical astronomy and astronomical instruments (sundials, astrolabes) entitled Jāmiʿ al-mabādiʾ wa’l-ghāyāt fī ʿilm al-mīqāt (Collection of the Principles and Objectives in the Science of Timekeeping). [1] The first half was translated into French by J. J. Sédillot in the early nineteenth century and published posthumously in 1834.[2] [3] This is now regarded as the most complete source about medieval Islamic astronomical instruments.[4] [5] He wrote this treatise in Cairo during the years 1276–1282.

Jami‘ al-Mabadi’ wa’l-Ghayat, al-Marrakushi's encyclopaedia of astronomy, describes sundials, astrolabes, armillary spheres, and quadrants (Khalili Collection of Islamic Art)