Abu Zayd Abd al-Rahman Mohammed al-Jadiri () (born in

Meknes Meknes ( ar, مكناس, maknās, ; ber, ⴰⵎⴽⵏⴰⵙ, amknas; french: Meknès) is one of the four Imperial cities of Morocco, located in northern central Morocco and the sixth largest city by population in the kingdom. Founded in the 11th c ...

, in 1375 and died in

Fez Fez most often refers to: * Fez (hat), a type of felt hat commonly worn in the Ottoman Empire * Fez, Morocco (or Fes), the second largest city of Morocco Fez or FEZ may also refer to: Media * ''Fez'' (Frank Stella), a 1964 painting by the moder ...

, probably in 1416) was the (time-keeper) at the

Qarawiyyin The University of al-Qarawiyyin ( ar, جامعة القرويين; ber, ⵜⴰⵙⴷⴰⵡⵉⵜ ⵏ ⵍⵇⴰⵕⴰⵡⵉⵢⵉⵏ; french: Université Al Quaraouiyine), also written Al-Karaouine or Al Quaraouiyine, is a university located in ...

Mosque. He wrote a

treatise A treatise is a formal and systematic written discourse on some subject, generally longer and treating it in greater depth than an essay, and more concerned with investigating or exposing the principles of the subject and its conclusions." Tre ...

on the determination of time of day and night, an (verse composition) in 26 chapters and 335 verses, entitled (1391/2), and a calendar adapted to the latitude of

, .Samso, J. "An Outline of the History of Maghribi Zijes from the End of the Thirteenth Century", in: ''Journal for the History of Astronomy'', p.94

References

Sources

* * Moroccan writers Medieval Moroccan astronomers Astronomers of the medieval Islamic world 1375 births 1416 deaths People from Meknes 14th-century Moroccan people 15th-century Moroccan people People from Fez, Morocco {{Morocco-scientist-stub