Abu Ali al-Hasan ibn Umar al-Marrakushi

أبو علي الحسن بن عمر المراكشي

c. 1220 CE · c. 617 AH† – c. 1282 CE · c. 681 AH† †

† Hijri date derived by computation from the Gregorian/Julian date; it may differ from the transmitted date by a day or two.

Marrakesh

Moroccan astronomer, mathematician and geographer of the seventh century AH, author of Jami' al-mabadi' wal-ghayat, known for sundial construction 1.

Depth

At a glance

Roles
Scholar
Era
The Crusades, Ayyubids and Mamluks
Region
Maghreb

Life in time

10001100120013001400150016001700 c. c.
The Buyid, Fatimid and Seljuk Era · The Crusades, Ayyubids and Mamluks · The Gunpowder Empires · The Mongol and Post-Mongol Era Contemporaries: Abd al-Mun'im ibn al-Faras al-Andalusi (Abu Muhammad, Maliki jurist) · Abd al-Rahman ibn Qudama al-Maqdisi · Abu Ishaq al-Ansari al-Tilimsani · Abu Yusuf Ya'qub al-Marini · Afif al-Din al-Tilimsani

In space

Marrakesh

Map: Natural Earth, public domain · places and route from the graph

Astronomy and timekeeping

Summary

Abu Ali al-Hasan ibn Umar al-Marrakushi was a Maghribi scholar renowned in astronomy, mathematics, geography and the making of sundials; the Bibliotheca Alexandrina book says he drew a map of the Maghrib correcting Ptolemy's errors and was the first to use, on a map, longitude lines marking equal hours, and gives the date 660/1261 with his name. 1

Works

They include a treatise on sighting the new moon and Jami' al-mabadi' wal-ghayat fi ilm al-miqat. 1

Connections

Explore the connections

Lived in
Marrakesh
Authored
Jami' al-mabadi' wal-ghayat (Abu Ali al-Marrakushi)

People and things also explored

Ibn al-Banna al-Marrakushi, Ahmad ibn Muhammad· al-Kutubiyya Mosque, Marrakesh· Almohad conquest of Marrakesh· Battle of al-Buhayra· Yusuf ibn Tashfin founds Marrakesh· Ibn Rushd becomes the caliph's physician (1182)· The Kutubiyya mosque at Marrakesh· Abd al-Hafid of Morocco

Sources

  1. Contributions of Arab and Islamic Civilisation to Astronomy from the Scientific Manuscripts of al-Azhar Library, Alexandria: Bibliotheca Alexandrina (CULTNAT) and UNESCO, 2006 , p. 16
Cite this page

islam.museum contributors. “Abu Ali al-Hasan ibn Umar al-Marrakushi”. islam.museum, https://islam.museum/en/person/abu-ali-al-hasan-al-marrakushi/. CC BY-SA 4.0. Last updated 2026-11-09.

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Wing

People

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Related

Ibn al-Banna al-Marrakushi, Ahmad ibn Muhammad

A scholar of Marrakesh in mathematics, arithmetic and astronomy, who wrote on the arithmetical sciences.