10th c. Cordova. First extant Andalusī treatise on astronomy. The only known manuscript is preserved in the Süleymaniye Library in Istanbul (Carullah Efendi 1279, fols. 315r-321v). 30 numbered and 5 unnumbered chapters. The unnumbered chapters differ from the others and do not seem to belong to the work. The chapters are: 1-8: signs of the Zodiac and Lunar mansions; 9–11: planets and cosmographical subjects; 12: stars; 13–16: moon and sun; 17–27: subjects related to the calendar, i.e. years, months, days, hours (22 and 23 are devoted to clocks); 28–30: description of the cosmos, both the superlunary and sublunary world. The other 5 chapters deal with the sun, moon, and terrestrial latitudes. Some of the chapters that purport to explain the physical structure of the cosmos show a clear dependence on Aristotle, while others draw upon Ptolemy, in particular on his Planetary Hypothesis, which may have reached the author through the Kitāb al-A`lāq al-nafīsa of the eastern geographer Abū `Alī Aḥmad ibn `Umar ibn Rustah. An analysis of his work offers only two chronological details: a quotation from Maslama al-Majrīṭī (d. 1007) and the statement in the title of the star table: “we found its longitude in the ecliptic in the year 300 of the Hijra” (912-3 CE). The clocks described are a sundial, the description of which coincides with the one found in the Kitāb al-asrār fī natā’ij al-afkār (Biblioteca Medicea-Laurenziana, MS. Misc. Or. 152, folio 47r), explicitly attributed to Ibn al-Ṣaffār, one of Maslama’s disciples. 2 texts describe a similar instrument (the balāṭa described in Ibn Isḥāq al-Tūnisī's Zīj and one in the commentary to the Mišná by Maimonides). A "fire clock” is described which is a similar clock found in a work by a certain Yūnus al-Miṣrī. The star table contains 16 stars. It is the first star table documented in al-Andalus and is influenced by al-Battānī and Maslama [see BEA, Comes]