Cod.: paper, II+178+III^a ff. (foliated with Arabic-European numerals in pencil above the body text on rectos; irregular quire numbers; no catchwords). One main hand in black with a clear ‘Yemenite square and semi-cursive script’ (British Library Archives and Manuscripts), occasionally vocalised. Titles of works and chapters in larger letters with outlines only; first folio nicely decorated with frame and floral motives in red and black. Diagrams in red with black labels; tables with red lines and headings. Possible later additions by cursive hands, some of them sketchier than others, in black or brown (67v–68r, 120v–124r). Codex in good condition except for the beginning and end; moisture stains (ff. 11–163) and restored margins (ff. 1–12 and 150–178), occasionally affecting the reading. Dimensions: 275×200 mm, written area: 205×145 mm; 24 lines per page. Modern black leather binding by the British Museum.

Cont.: chronology, mathematics, geometry, astronomy. — Index: Joseph ben Japhet ha-Levi, Ner Yisraʾel (1r–15r, Judaeo-Arabic); a partial Hebrew translation of the previous treatise, with additional tables (15v–28r); anonymous, Kitāb al-Misāḥa (28v–67r); sketchy notes, including birth notes (dated 1479–1485) and an astronomical poem (67r–68r); Muḥammad b. Abī Bakr al‐Fārisī, al-Zīj al-Muẓaffarī (68v–118r, almost complete set of tables); several notes in Judaeo-Arabic and Arabic, partially by different hands, some attributed to Hermes, Balīnūs and Aristotle, filling empty spaces on the title pages for the five planetary equations in the previous work (84r, 86r, 89r, 93r, 96r); anonymous, Mā l-dalīl ʿalā anna li-l-shams ḥaraka dhātiyya (118v–120v, fragment, with attribution ‘qāla Aflāṭūn’ on f. 119v); fragmentary notes (120v–124r); al-Fārisī, Kitāb Maʿārij al-fikr al-wahīj fī ḥall mushkilāt al-zīj (124v–171r); Ptolemaica (171v–176r); Aḥmad b. Muḥammad b. Ibrahīm al-Ashʿarī, treatise on geometry (176v–178v, incomplete). Blank: none.

Bibl.: Adolf Neubauer, ‘The Literature of the Jews in Yemen’, The Jewish Quarterly Review 3 (1891), pp. 604–622, here pp. 619–621; George Margoliouth and Jacob Leveen, Catalogue of the Hebrew and Samaritan Manuscripts in the British Museum, vol. IV, London: The British Museum, 1935, p. 154; Bernard R. Goldstein, ‘The Survival of Arabic Astronomy in Hebrew’, Journal for the History of Arabic Science 3 (1979), pp. 31–39, here pp. 31–32 n. 2, item (c); Régis Morelon, Thābit ibn Qurra. Œuvres d’astronomie, Paris: Les Belles Lettres, 1987, pp. xxxix–xl. — British Library Archive and Manuscripts: http://searcharchives.bl.uk/permalink/f/79qrt5/IAMS032-003312274 (with scans).