Abd al-Rahman al-Jadiri

Abu Zayd Abd al-Rahman Mohammed al-Jadiri (عبد الرحمن الجدري) (born in Meknes, in 1375 and died in Fez, probably in 1416) was the (time-keeper) at the Qarawiyyin Mosque.

He wrote a treatise 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 Fez,.