In al-Andalus and the Maghreb, various astronomers continued producing zijat (planetary tables) in the tradition of Azarqueil , introducing new parameters, giving new presentation to old tables, and compiling new ones, but hardly deviating from the essential features established by their predecessors.
Among the astronomers was Ibn Ishaq Al-Tunisi.
According to Ibn Khaldun in his Muqaddima, Abul Abbas Ahmad ibn Ali ibn Ishaq al-Tamimi al-Tunisi was a Tunisian astronomer of the early thirteenth century.
He compiled an impressive astronomical handbook with tables.
It contains an important set of tables which mark the starting point of a Maghribian astronomical school.
The unfinished set of tables by Ibn Ishaq survived in a unique manuscript of Hyderabad, discovered in 19878 by David. A. King.
The predominant influence in Ibn Ishaq tables was that of the Andalusia school represented by Ibn-Zarqalluh, Ibn al-Kammad and Ibn al-Haim.
Ibn Ishaq Al-Tunisi (1193-1222)
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