Cod.: yellow paper, II+158+II^a ff. (foliated with black Hindu-Arabic numerals in pen, centered above the text body on rectos, up to f. 153r; this foliation is continued at the top left of rectos with Hindu-Arabic numerals in pencil, while the earlier foliation starts anew with 1 on f. 153v and 2 on f. 154r; additional foliation with Arabic-European numerals in pencil at the top left of scattered rectos, running entirely parallel to the main foliation; catchwords in black or red). A single neat, formal, and fully dotted nastaʿlīq hand in black; no shaddas, substantial hamzas except on initial alifs, no vowels; the size and boldness of the writing vary across the text. Book and chapter headings in the same main hand and size in red; chapter headings introduced by abjad numerals in bold black overlined in red; sections indicated with red overlines and sometimes introduced by formulaic qāla or aqūlu in red or in black overwritten in red. Undotted abjad numerals mostly in black and less often in red; Hindu-Arabic numerals in red. Substantial diagrams with mostly red lines and black geometrical points, occasionally the other way around; diagram labels in black and red; some unfinished diagrams (23v–24r) and few spaces for diagrams left blank (particularly on ff. 13r–29r); some diagrams in the margins and some pasted diagrams (e.g., ff. 14r, 14v, 16r, 16v, 22v, 41r, 122v and 124r). Substantial tables with red lines and headings and tabular values in red and black; one table left blank (17v). Codex in very good condition; no moisture stains, occasionally worm-eaten, two major inkblots (20r, 119r), few smudges, some wear on the covers. Dimensions: 30×17½ cm, written area: 19×10 cm; 23 lines per page. Rebound; purple cloth cover on pasteboard; wooden-like marbled pasteboard on top of the cloth cover except spine and corners. Type III binding.

Cont.: astronomy. — Index: two astronomical diagrams, one pasted, with Persian text and a reference to al-Birjandī (IIr); Ptolemaica (1v–152r); Ptolemaica (153v–156r); Ptolemaica (156r–158r). Blank: Iv, IIv–1r, 152v–153r, 158v–II^av.

Bibl.: Wilhelm Ahlwardt, Verzeichniss der arabischen Handschriften der Königlichen Bibliothek zu Berlin, vol. V, Berlin: Asher, 1893, pp. 143–144 (no. 5655) and p. 161 (no. 5680); Paul Kunitzsch, Claudius Ptolemäus. Der Sternkatalog des Almagest. Die arabisch-mittelalterliche Tradition, 3 vols, Wiesbaden: Harrassowitz, 1986–1991, vol. III, pp. 9–10; LAMTMª José Parra, ‘A List of Arabic Manuscripts of Naṣīr al-Dīn al-Ṭūsī’s Taḥrīr al-Majisṭī’, Suhayl 16–17 (2018–2019), pp. 251–322, pp. 259–260 (no. 15) and 312. — Qalamos: https://www.qalamos.net/receive/DE1Book_manuscript_00014160.