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Loading contentClaudius Ptolemy worked in Roman Alexandria in the 2nd century CE. His Almagest synthesised Greek astronomy into a complete geometric model in which the Sun, Moon, and planets circle a central Earth — a system so successful that it dominated astronomy in Europe and the Islamic world for more than 1,400 years.
Facts on this topic will be cited from these primary and reference sources.
General reference for the history of astronomy, biographies, and cultural context.
Official naming, definitions, constellation boundaries, and astronomical nomenclature.