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Ptolemaeus

Arabus et Latinus

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Vatican, Biblioteca Apostolica Vaticana, Reg. lat. 1904

s. XV-XVI.

Paper, 103 f., fours hands (I: f. 1-56; II: f. 57-70r and 86-102; III: f. 70v-83v; IV: 84v and 85r).

Astronomy and mathematics: Ptolemaica (1r-56r and 57r-61r); ‘Kardaga est porcio circuli ex 15 gradibus…’ (61r-62v); Thebit Bencora, De figura sectore, anonymous tr. (62v-70r); Jordanus of Nemore, Elementa super demonstrationem ponderum (70v-73r); Liber de canonio (73v-76v); fragment on the Roman balance ‘Queritur in longitudine…’, attr. Thebit (76v-77r); Pseudo-Euclid, De ponderoso et levi (77r-78r); Pseudo-Thebit Bencora, De motu octave spere (79r-83v); ‘Data elevationis (?) cum instrumento ab orizonte… Esto meridianus circulus abcd…’ (84v); ‘Nota quod habita notitia arcus diei et altitudinis Solis…’ (85r); Euclid, Elementa, tr. Gerard of Cremona, excerpts XV.1-5 and XIII.16 (86r-90r); John of Ligneres, Canones primi mobilis (91r-102v). Blank: 56v, 78v, 84r, 85v, 90v, 103.

Lit. ---

1r‑56r

‘Diffinitio tractatus tertii Iohannis de Blanchinis de Bononia. Si duo numeri ad invicem multiplicentur et productum per primum multiplicantem — et aggregati radix diminuta medietate arborum valet res.’

= Giovanni Bianchini, Flores Almagesti (C.1.16). III, 1r-12r; IV, 12r-17r; V, 17v-37v; I, 38r-52r; II, 52v-56r. A few marginal notes by the scribe.

57r‑61r

‘Incipit liber primus Thebith de his que indigent expositione antequam legitur Almagesti. <E>quator diei est circulus maior qui describitur super duos polos orbis ― aut propinqui oppositioni erunt retrogradi. Explicit Thebith filii Chorae de his quae indigent expositione antequam legatur Almagesti.’