Abd al Rahman al Jadiri

Abu Zayd Abd al-Rahman Mohammed al-Jadiri (born in Meknes, in 1375 and died in Fez, probably in 1416) was muwaqqit (time-keeper) at the Qarawiyyin Mosque. He wrote a treatise on the determination of time of day and night, an urzija (verse composition) in 26 chapters and 335 verses, entitled Raudat al-azhar fl 'ilm waqt al-lail wal-nahar (1391/2) and a calendar adapted to the latitude of Fez Tanbllt al-afliím 'ala mii ya/:tduthu ji ayyiim al-'iim.