Abū’l-‘Abbās al-Faḍl ibn Ḥātim al-Nairīzī (Latin name: Anaritius), was a 9th-10th century Persian mathematician and astronomer from Nayriz, a town near Shiraz, Fars, Iran. He flourished under al-Mu'tadid, Caliph from 892 to 902, and compiled astronomical tables, writing a book for al-Mu'tadid on atmospheric phenomena. Nayrizi wrote commentaries on Ptolemy and Euclid. The latter were translated by Gerard of Cremona. Nairizi used the so-called umbra… (More on Al-nayrizi)