Abu Jafar Ahmad ibn Yusuf ibn al‐Kammad () (died 1195) was a

Muslim Muslims ( ar, المسلمون, , ) are people who adhere to Islam, a monotheistic religion belonging to the Abrahamic tradition. They consider the Quran, the foundational religious text of Islam, to be the verbatim word of the God of Abrah ...

Arab The Arabs (singular: Arab; singular ar, عَرَبِيٌّ, DIN 31635: , , plural ar, عَرَب, DIN 31635: , Arabic pronunciation: ), also known as the Arab people, are an ethnic group mainly inhabiting the Arab world in Western Asia, ...

astronomer born in

Seville Seville (; es, Sevilla, ) is the capital and largest city of the Spanish autonomous community of Andalusia and the province of Seville. It is situated on the lower reaches of the River Guadalquivir, in the southwest of the Iberian Peninsula ...

Al-Andalus Al-Andalus DIN 31635, translit. ; an, al-Andalus; ast, al-Ándalus; eu, al-Andalus; ber, ⴰⵏⴷⴰⵍⵓⵙ, label=Berber languages, Berber, translit=Andalus; ca, al-Àndalus; gl, al-Andalus; oc, Al Andalús; pt, al-Ândalus; es, ...

. He is known to have been educated in Cordoba by the students of Al-Zarqali. His works such as ''al Kawr ala al dawr, al Amad ala al abad'', and ''al Muqtabas'', which is a compilation of the two previous

Zij A zij ( fa, زيج, zīj) is an Islamic astronomical book that tabulates parameters used for astronomical calculations of the positions of the Sun, Moon, stars, and planets. Etymology The name ''zij'' is derived from the Middle Persian term ' ...

, made him famous not only on the

Iberian peninsula The Iberian Peninsula (), ** * Aragonese and Occitan: ''Peninsula Iberica'' ** ** * french: Péninsule Ibérique * mwl, Península Eibérica * eu, Iberiar penintsula also known as Iberia, is a peninsula in southwestern Europe, defi ...

but across

North Africa North Africa, or Northern Africa is a region encompassing the northern portion of the African continent. There is no singularly accepted scope for the region, and it is sometimes defined as stretching from the Atlantic shores of Mauritania in ...

, and specifically

Tunisia ) , image_map = Tunisia location (orthographic projection).svg , map_caption = Location of Tunisia in northern Africa , image_map2 = , capital = Tunis , largest_city = capital , ...

, where the astronomer Ibn Ishaq al-Tunisi wrote commentaries on his works. An astrological work, ''Kitāb Mafātīḥ alasrār'', (in which he states the duration of pregnancy depended on the horoscope) is also attributed to him and was strongly criticized by Ibn al‐Haim al‐Ishbili in the latter's ''al Zīj al kāmil'' (c.1205).

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{{DEFAULTSORT:Ibn Al-Kammad 1195 deaths 12th-century Arabs 12th-century Al-Andalus people Astronomers of Al-Andalus 12th-century astronomers Year of birth unknown People from Seville 12th-century Arabic writers