era Ptolemy's world map – map of the ancient world as described by Ptolemy Footnotes Works cited . . Further reading Theoretical and Practical Astrology: Ptolemy and his Colleagues by Mark Riley, 1974; Transactions of the American Philological Association, 117, (Baltimore; London: Johns Hopkins University Press). Explores the difference of approach taken by Ptolemy to that of other contemporary astrologers. Science and Tradition in the Tetrabiblos by Mark Riley, 1988; Proceedings of the American Philosophical Society, 132.1, (Philadelphia: American Philosophical Society). Considers the question of what Ptolemy contributed to astrology and why his work was so significant. External links English language reproductions of the Tetrabiblos and associated texts Henry Coley, Centiloquium from Clavis Eliminata (1676); London: Josuah Coniers. Skyscript; retrieved 26 November 2011. J. M. Ashmand's translation of Paraphrase (1822); London: Davis and Dickson. Sacred Texts Archive; retrieved 16 November 2011. James Wilson's translation Paraphrase (1828); London: William Hughes. Google Books; retrieved 16 November 2011. Frank E. Robbins' translation of Tetrabiblos (1940); Cambridge, Mass.: Harvard University Press; London: W. Heinemann. LacusCurtius; retrieved 16 November 2011. Frank E. Robbins' translation of Tetrabiblos bound with W. G. Waddell's translation of Manetho's History of Egypt (1940). Cambridge, Mass.: Harvard University Press; London: W. Heinemann. Internet Archive, retrieved 16 November 2011. Greek and Latin reproductions of the Tetrabiblos and associated texts Erhard Ratdolt, Venice, 1484. First printed Latin edition of Tetrabiblos based on Egidio Tebaldi's 13th-century Latin translation out of Arabic. Also includes the Centiloquium and Commentary by Haly Abenragel (Albohazen). Biblioteca Virtual del Patrimonio Bibliografico; retrieved 10 November 2011. Bonetum Locatellum, Venice, 1493. Compemdium of Latin texts including the Tetrabiblos, Centiloquium, and Ali ibn Ridwan's Commentary. Gallica Bibliothèque nationale de France; retrieved 20 November 2011. Heirs of Octavius Scoti, Venice, 1519. Compendium of Latin texts including the Tetrabiblos and Centiloquium. Universidad de Sevilla; retrieved 20 November 2011. Johannes Hervagius, Basel, 1533. Latin edition based on Plato de Tivoli's translation. Warburg Institute; retrieved 19 November 2011. Heinrich Petri, Basel, 1541. Latin edition containing Ptolemy's Almagest, Tetrabiblos, and the Centiloquium. Biblioteca Virtual del Patrimonio Bibliografico; retrieved 19 November 2011. Heinrich Petri, Basel, 1591. Latin reproduction of Hieronymous Wolf's translation the 'anonymous' Commentary attributed to Proclus. Biblioteca Virtual del Patrimonio Bibliografico; retrieved 19 November 2011. Leo Allatius, Lugd. Batavorum, 1635. Greek and Latin translation of the 'anonymous' Proclus Paraphrase (Procli Diadochi Paraphrasis) based on manuscripts housed in the Vatican Library (oldest dates to 10th century: Codex