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“Ptolemaic system” as a book category gathers works about the geocentric cosmology formulated by Claudius Ptolemy and its long intellectual afterlife. It includes translations and commentaries on the Almagest and related texts; explanations of core mechanics such as epicycles, deferents, and the equant; histories of ancient Greek, Hellenistic, Islamic, and medieval European astronomy; studies of astronomical instruments and tables derived from the model; and analyses of the system’s philosophical, religious, and cultural reception. It also covers comparative works on the Copernican and Newtonian overturning of geocentrism, biographies of key figures, and accessible introductions that situate the Ptolemaic worldview within the broader narrative of the scientific revolution.

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