From: Thomas Hockey et al. (eds.). The Biographical Encyclopedia of Astronomers, Springer Reference. New York: Springer, 2007, pp. 548-549
Ibn Abī al‐Shukr: Muḥyī al‐Milla wa‐ʾl‐Dīn Yaḥyā Abū ʿAbdallāh ibn Muḥammad ibn Abī al‐Shukr al‐Maghribī al‐Andalusī [al‐Qurṭubī]
Died Marāgha, (Iran), June 1283
Ibn Abī al‐Shukr carried out a large‐scale project of systematic planetary observations, which led to the determination of a number of new astronomical parameters. He belonged to the group associated with the Marāgha Observatory, several of whose members developed new planetary models whose influence on Nicolaus Copernicus has been clearly demonstrated. These models were meant to deal with the criticisms of Ptolemaic astronomy that had been previously set forth in Egypt (11th century) and al‐Andalus (12th century). Ibn Abī al‐Shukr also compiled Arabic versions of the most important Greek trigonometric treatises and made some useful innovations.
We know little of Ibn Abī al‐Shukr's early life, but his name suggests an Andalusī origin. It is also known that he studied the religious law of the Mālikī School, a school with a wide influence in al‐Andalus. As for the eastern part of his life, we know that he lived in Damascus at least until the year 1258, where he is believed to have written the Tāj al‐azyāj (The crown of astronomical handbooks), or at least the first version of it. Furthermore, he himself told Bar Hebraeus that his knowledge of astrology had saved his life when the Mongols invaded Damascus (circa 1258). According to Ibn al‐Fuwaṭī, the librarian of the Marāgha Observatory, he joined Naṣīr al‐Dīn al‐Ṭūsī's team at Marāgha at an unknown date, though clearly before 1262, the year that Ibn Abī al‐Shukr himself mentions as the date of some astronomical observations that he conducted at the Marāgha Observatory. In fact, he probably joined the team before 1260, because at that date his Taḥrīr al‐uṣūl (Recension of Euclid's Elements) was being copied in Marāgha, perhaps by his own hand. According to the sources, Ibn Abī al‐Shukr worked for some 20 years in Marāgha, and in 1275 he composed his second zīj, entitled Adwār al‐anwār madā al‐duhūr wa‐ʾl‐akwār in which he introduced the results of the astronomical observations he carried out in Marāgha.
Ibn Abī al‐Shukr was a good mathematician, and his writings on trigonometry contain certain original elements. After traveling at least once to Baghdad with Naṣīr al‐Dīn al‐Ṭūsī's son, he went back to Marāgha, where he devoted his life to teaching. Ibn Abī al‐Shukr died in Marāgha, where he enjoyed an excellent reputation.
Ibn Abī al‐Shukr's work deals with three different subjects: astronomy, astrology, and mathematics (geometry and trigonometry). Most of his work has not yet been studied, so for the moment no definitive account of his contribution to Islamic science is possible.
Ibn Abī al‐Shukr's astrological works are mainly devoted to horoscopes and planetary conjunctions used to tell the future.
His known works on astronomy include three zījes; three commentaries on the Almagest; a description of the construction and use of the astrolabe (Tasṭīḥ al‐asṭurlāb); a description of the geometrical methods used to determine the meridian line, the rising amplitude, and the revolution of the sphere (Maqāla fī istikhrāj taʿdīl al‐nahār wa saʿat al‐mashriq wa‐ʾl‐dāʾir min al‐falak bi‐ṭarīq al‐handasa); and a chronological work on the Chinese and Uighur calendars (Risālat al‐Khaṭā wa‐ʾl‐īghūr). Hūlāgu and his brother Qubilai, rulers of Marāgha and Beijing, respectively, were both interested in astronomy and had their astronomers translate works on the subject from Arabic and Persian into Chinese.
Two of the zījes, the Tāj al‐azyāj wa‐ghunyat al‐muḥtāj (= al‐muṣaḥḥaḥ bi‐adwār al‐anwār maʿa al‐raṣad wa‐ʾl‐iʿtibār, according to Escorial MS 932) and the Adwār al‐anwār madā al‐duhūr wa‐ʾl‐akwār, represent a break in the Andalusī–Maghribī tradition. The only Andalusī materials preserved are the tables of geographical coordinates. According to the author, in the second zīj he included the results of the astronomical observations he carried out in Marāgha. However, we find some of these results in the Maghribī copies of the Tāj for which, according to the title of one of the manuscripts, the Adwār was used. Echoes of these zījes, especially of the Tāj, resonate not only in al‐Maghrib but also in Hebrew and Latin European sources, especially in Barcelona. One example is the abandonment of the trepidation models, which are found in all the Andalusī and Maghribī zījes, and the proposal of a new parameter for precession. The only extant copy of the third zīj, entitled ʿUmdat al‐ḥāsib wa‐ghunyat al‐ṭālib and compiled in Marāgha (circa 1262) after the Tāj and before the Adwār, is a mixture of different zījes and has nothing to do with Ibn Abī al‐Shukr's work.
With regard to the Almagest, he wrote the Talkhīṣ al‐Majisṭī (Compendium of the Almagest), based on his observations carried out between the years 1264 and 1275; the Khulāṣat al‐Majisṭī (Summary of the Almagest), different from the Talkhīṣ; and the Muqaddimāt tataʿallaq bi‐ḥarakāt al‐kawākib (Prolegomena on the motion of the stars), which contains five geometric premises on the planetary motions in the Almagest.
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——— (1985). “Solar Observations at the Maraghah Observatory before 1275: A New Set of Parameters.” Journal for the History of Astronomy 16: 113–122. (Reprinted in Saliba, A History, pp. 177–186.)
——— (1986). “The Determination of New Planetary Parameters at the Maragha Observatory.” Centaurus 29: 249–271. (Reprinted in Saliba, A History, pp. 208–230.)
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