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“Ptolemaic astronomy” covers books on the geocentric astronomical system formulated by Claudius Ptolemy in the 2nd century CE and the scholarly tradition it inspired through late antiquity, the Islamic Golden Age, and medieval to early Renaissance Europe. Works in this category include editions and translations of primary texts (especially the Almagest), commentaries and technical reconstructions of its mathematical machinery (deferents, epicycles, eccentrics, the equant), star catalogs and planetary theories, studies of observational practice and instruments (e.g., astrolabes, armillary spheres), and computational tables used in education and calendrical work. The category also encompasses research on transmission and adaptation by later astronomers (such as al-Battani, al-Tusi, Ibn al-Shatir, Peuerbach, and Regiomontanus), the system’s interplay with astrology and timekeeping, and its critique and eventual displacement by Copernican, Tychonic, and Keplerian models.

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