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Ptolemaeus Arabus et Latinus

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Work A.5.1

Liber de Analemmate (tr. William of Moerbeke)

Translated from the Greek by William of Moerbeke probably in 1270. MS Vatican, BAV, Ottob. lat. 1850 is William’s autograph copy.

Note 1

MS Oxford, BL, Savile 9, s. XVII, contains, under the title ‘Ptolemaeus de Analemmate’, definitions of astronomical terms, such as ‘horizon’, ‘meridianus’, ‘verticalis’, etc. (f. 1r-1v); and, under the title ‘De angulis et peripheriis subtensis ex doctrina Ptolemaei’, various astronomical notes on sundials (f. 2r-9r). On this manuscript, see F. Madan, H. H. E. Craster, A Summary Catalogue of Western Manuscripts in the Bodleian Library at Oxford, II.2, Oxford, 1937, 1099 (no. 6556).

Note 2

Federico Commandino revised William of Moerbeke’s translation and published it, together with his commentary, in 1562. See C.4.2.


‘(Vatican, BAV, Ottob. lat. 1850) Claudii Ptolemei liber de Analemmate incipit. Consideranti mihi, o Syre, angulorum acceptorum in locum gnomonicum quod rationale et quod non, habitum quidem virorum illorum in lineis accidit admirari etiam in hiis et valde acceptare — horarii autem ad eum qui secundum verticem, descensivi autem ad orizontem. Habent autem et canones ita’ (followed by the table ‘Cancri principium horarum 13’).


F. J. Carmody, Arabic Astronomical and Astrological Sciences in Latin Translation. A Critical Bibliography, Berkeley-Los Angeles, 1956, 16 (no. 2). See also A.5 and C.4.2-3.


Heiberg, ‘Ptolemäus’ (from Vatican, BAV, Ottob. lat. 1850); Heiberg, Claudii Ptolemaei, 189-223 (from Vatican, BAV, Ottob. lat. 1850); Edwards, 33-76 (from Vatican, BAV, Ottob. lat. 1850, with an English translation, 77-135); Sinisgalli/Vastola (from ed. Rome 1562 [about which see C.4.2] with facing Italian translation); Guerola Olivares, 287-321 (from Vatican, BAV, Barb. lat. 304, with facsimile on 323-343).