Abu Ali al-Hassan al-Marrakushi
الحسن المراكشي
The Jami‘ al-Mabadi’ wa’l-Ghayat, (Khalili Collection of Islamic Art)
Born	fl. late 13th century
Academic work
Era	Islamic Golden Age
Main interests	Mathematics, astronomy
Notable works	Jāmiʿ al-mabādiʾ wa’l-ghāyāt fī ʿilm al-mīqāt (Collection of the Principles and Objectives in the Science of Timekeeping)

Abu Ali al-Hassan al-Marrakushi (Arabic: الحسن المراكشي; late 13th century) was a Magreb astronomer and mathematician from the Kingdom of Morocco . He was especially important in the field of trigonometry and practical astronomy. He wrote Jāmiʿ al-mabādiʾ wa’l-ghāyāt fī ʿilm al-mīqāt (Collection of the Principles and Objectives in the Science of Timekeeping), a treatise on spherical astronomy and astronomical instruments.^[1] The first part was translated into French by the orientalist and astronomer Jean Jacques Emmanuel Sédillot [fr] during the early 19th century, and published after Sédillot's death.^{[2][page needed]}

The treatise, which was written in Cairo between 1276 and 1282, is regarded as the most complete source to have survived about medieval Islamic astronomical instruments.^{[3][page needed][4]}

Legacy

The crater Al-Marrakushi on the Moon is named after him.^{[citation needed]}