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Ptolemaeus Arabus et Latinus

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Florence, Biblioteca Riccardiana, 885

s. XIIIex-XIV1 (except for f. 350v, added in the 14th c., perhaps in the second half).


northern Italy, perhaps Padua, by the second half of the 14th c. (see glosses f. 350v).

Parchment, 368 f., several hands.

Astronomy, computus, optics and astrology: Robert Grosseteste, De sphera, beginning gone (1ra-7vb); canons of Toledan tables (8ra-30vb); Alfraganus, De scientia astrorum, tr. Gerard of Cremona (32r-53v); Pseudo-Messahallah, De compositione astrolabii, use (53v-57r); empty table meant for geographical coordinates of cities (57v); Campanus of Novara, Theorica planetarum (58r-104r); Pseudo-Messahallah, De compositione astrolabii, construction (104r-107r); added notes and diagrams of geometry, astronomy and astrology (107v-108v), including Jordanus of Nemore (?), ‘Ab eodem puncto quotlibet simul circulariter…’ (107v-108r); Ptolemaica (109r-123v); Ibn Mu‘ādh, De crepusculis (124r-131v); Euclid, De visu, ed. Witelo (?) (132r-143v); Roger Bacon, De perspectiva (144r-199v); Pseudo-Jordanus, Liber de triangulis, fragment (199bisr); Roger Bacon, De speculis comburentibus (200r-212r); Robert Grosseteste, De cometis (213r-214v); ‘Incipit prologus in assignationem errorum kalendarii et eorundem correctionem. Quoniam ex diversitate cursuum Solis et kalendarii scandalorum occasio…’ (215r-217v); calendar (218r-223v); Robert Grosseteste, Compotus (224ra-248rb), with tables (248rb-251r); Campanus of Novara, Compotus maior (252r-307v); calendar (308r-311r); Rabanus Maurus, Liber de computo (312r-346r); dimensions of Noah’s Ark ‘Moyses vir disciplinarum peritus…’ (346r-348v); Rabanus Maurus, Liber de computo, beginning only (349r); Ptolemaica (350v-368v); astrological notes ‘Cum volueris de temperie vel intemperie aeris aliquid scire…’ (367v). Blank: 31, 199bisv, 212v, 250r, 251v, 311v, 349v-350r.


Inventario e stima della Libreria Riccardi. Manoscritti e edizioni del secolo XV, Firenze, 1810, 21; L. Thorndike, ‘Notes upon Some Medieval Astronomical, Astrological and Mathematical Manuscripts at Florence, Milan, Bologna and Venice’, Isis 50 (1959), 33-50: 38-40; F. S. Benjamin, G. J. Toomer, Campanus of Novara and Medieval Planetary Theory, Theorica planetarum, Madison-London, 1971, 90; D. C. Lindberg, Roger Bacon’s Philosophy of Nature. A Critical Edition, with English Translation, Introduction, and Notes of De multiplicatione specierum and De speculis comburentibus, Oxford, 1983, lxxix; M. Clagett, Archimedes in the Middles Ages, V, Philadelphia, 1984, 345; D. C. Lindberg, Roger Bacon and the Origins of Perspectiva in the Middle Ages. A Critical Edition and English Translation of Bacon’s Perspectiva, with Introduction and Notes, Oxford, 1996, ciii; R. Lemay, Le Kitāb at-Tamara (Liber fructus, Centiloquium) d’Abū Ja’far Aḥmad ibn Yūsuf [Ps.-Ptolémée], New York, 1999 [unpublished], I, 246-247; C. Panti, Moti, virtù e motori celesti nella cosmologia di Roberto Grossatesta. Studio ed edizione dei trattati De sphaera, De cometis, De motu supercelestium, Firenze, 2001, 256-257; F. S. Pedersen, The Toledan Tables. A Review of the Manuscripts and the Textual Versions with an Edition, København, 2002, I, 121; A. Lohr, C. P. E. Nothaft, Robert Grosseteste’s Compotus, Oxford, 2019, 29-30.



‘Almagesti [title in upper margin, perhaps by a later hand]. Omnium recte phantium (!) verisimilibus coniecturis etc. notum per 18am huius secundi A sit…’

= Commentary on the Almagesti minor (C.1.7), abrupt end in II.35 due to missing folia, first paragraph blank. No glosses.


‘Prologus in Centilogium Pto<lome>i Pheludensis. Dixerunt Pto<lomeus> et Hermes quod locus Lune in hora in qua fuit expertus multotiens.’

= Pseudo-Ptolemy, Dixerunt Ptolemeus et Hermes quod locus Lune... (B.5), considered the ‘prologue’ to the Centiloquium below, but added by a later hand on what was originally a blank page. One short marginal note referring to v. 51 of the Centiloquium.


‘De stellis comatis [added title, perhaps by another hand]. Pto<lomeus> dixit quod stelle cum caudis sunt 9 regibus et divitibus apparebit, morietur populus. Et cum Saturno mortalitas gravior, cum Marte vero guerre erunt quamplures et per gloriam (?) mortalitates, si autem cum Iove fiunt.’

= Pseudo-Ptolemy, De cometis (B.4), added by the same hand that copied B.5 above. Glosses by what seems to be a later hand on the comet of 1368: ‘A nativitate Christi 1368, die 8 vel circa Martii, apparuit in occidente una prope Martem, g<radu> 10 vel circa et duravit ultra 8 dies… Item circa primum mensis Aprilis… apparuit una alia stella comata maiora… eiusdem mensis XXV die imperator Karolus intravit Paduam… in magna concordia cum pappa Urbano V qui Romam intraverat 16 die Octobris 1367…’.


‘<D>icit Pthol<omeu>s: Iam scripsi tibi, Iesure, de hoc quod operantur stelle in hoc seculo… Verbum primum. Sciencia stellarum ex te et illis… Quod dixit Pthol<omeu>s, ex te et illis, significat quod qui res futuras prenoscere — Et ego Deum deprecor ut te diligat. Perfecta est huius libri translatio 17 die mensis Martii, 12 die mensis Gumedi secundi anno Arabum 520’ [added in the margin by the scribe: ‘Explicit…’, followed by several illegible words].

= Pseudo-Ptolemy, Centiloquium (tr. Plato of Tivoli) (B.1.2). The last two bifolia are in disorder and should be read f. 366-365-368-367. F. 351-352 (v. 1-10) consist of a bifolium copied in a neat hand, while f. 353-368 (v. 10-100) are from another MS copied in a different, sloppier hand. A possible scenario is that the scribe of f. 351-352 intended to copy the whole text anew, but stopped in the middle of v. 10 and appended f. 353-368, which may have been his exemplar. The two introductory chapters on f. 350v were added by a later hand (see above). Glosses throughout by what seems to be yet a later hand (including notes on the comet of 1368 on f. 350v, see below).