Book detail: Ptolemy's Almagest is presented as a focused source page for quotations connected with this book, collection, transcript, or source record.
Ptolemy's Almagest is a comprehensive astronomical work from the 2nd century CE, originally titled 'Mathematical Syntaxis'. It systematically describes a geocentric cosmology where the Earth is stationary at the center, with the Sun, Moon, planets, and stars revolving around it in complex circular paths. The book compiles and extends the astronomical knowledge of earlier Greek thinkers, such as Hipparchus, and introduces the Ptolemaic system, which uses epicycles and deferents to account for planetary motions. It includes star catalogs, tables for calculating positions, and explanations of phenomena like eclipses. For over a thousand years, the Almagest served as the authoritative text on astronomy in both the Islamic world and medieval Europe, until the Copernican revolution challenged its geocentric assumptions.
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