Project icon: lavishly furnished initial letter with a painting of Ptolemy using an astrolab.

Ptolemaeus Arabus et Latinus

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Escorial, Real Biblioteca del Monasterio de San Lorenzo, O.II.10

s. XIIIex-XIVin.


northern France, perhaps Paris.


John of Murs, who heavily annotated the MS, at least from 1321 to 1344 (Gushee, 12); monastery of Poblet? (Antolín).

Parchment, 226 f., one or two neat hands copied the core of the MS, richly decorated initials.

Computus, arithmetic and astronomy: the original core of the MS includes Pseudo-Robert Grosseteste, Kalendarium (4r-10r); Tabula Gerlandi (10v-12rb); Balduinus de Mardochio or Marrochio, Compotus manualis (12rb-17v); Sacrobosco, Algorismus (19r-26r); Sacrobosco, De sphera (26v-39v); Sacrobosco, Computus (40r-63v); Robertus Anglicus, Quadrans vetus (64r-67v), with solar tables (68r-68v); Pseudo-Messahallah, De compositione astrolabii, beginning only (69r-71v); Theorica planetarum Gerardi (72r-79v); Pseudo-Thebit Bencora, De motu octave spere (80v-84r); Ptolemaica (84v-88r); Thebit Bencora, De recta imaginatione spere et circulorum eius diversorum (88v-90r); Thebit Bencora (?), De quantitate stellarum et planetarum et proportione terre (90r-92r); canons of Toledan tables (94r-123r); Toledan tables (124r-204r), including a selection of John of Ligneres’s canons, added by a 14th-c. hand (186r-189v); on eclipses ‘Ut annos Arabum et menses et per consequens…’, dated 1277 (205ra-217rb). Blank: 80r. John of Murs glossed most of the texts and added notes, tables and personal observations, mainly of an astronomical nature, on originally blank pages, f. 1-3, 18, 92v-93v, 123, 204v and 217v-226v.


G. Antolín, Catálogo de los códices latinos de la Real Biblioteca del Escorial, III, Madrid, 1913, 209-211; L. Gushee, ‘New Sources for the Biography of Johannes de Muris’, Jounal of the American Musicological Society 22 (1970), 3-26; G. Beaujouan, ‘Observations et calculs astronomiques de Jean de Murs (1321-1344)’, in Proceedings of the XIVth International Congress of the History of Science (Tokyo-Kyoto 1974), Tokyo, 1975, 27-30 (reprinted in G. Beaujouan, Par raison de nombres. L’art du calcul et les savoirs scientifiques médiévaux, Aldershot, 1991, VII); F. S. Pedersen, The Toledan Tables. A Review of the Manuscripts and the Textual Versions with an Edition, København, 2002, I, 114. M. Husson, ‘Exploring the Temporality of Complex Computational Practice: Two Eclipse Notes by John of Murs in the ms Escorial O II 10’, in How do Writings in the Early Astral Sciences Reveal Mathematical Practices and Practitioners?, eds M. Husson, R. L. Kremer, special issue of Centaurus 58 (2016), 46-65.


‘Thebit Bencorat de hiis que indigent expositione antequam legatur Al<magesti>. Equator diei est circulus maior qui describitur super 2 polos mundi — propinqui oppositioni Solis erunt, erunt retrogradi. Explicit Thebit de hiis que indigent expositione antequam legatur Almagesti et dicitur Equator diei.’

= Thebit Bencora, De hiis que indigent expositione antequam legatur Almagesti (C.1.1). No glosses. One marginal correction by the scribe f. 87r. Notes dated 1342 added by John of Murs after the explicit f. 88r.