Ptolemy in the Alexandria Observatory Claudius Ptolemy (Claudius Ptolemaeus) (c. AD 100 – c. 170) was a Greek mathematician, astronomer, geographer and astrologer. He lived in the city of Alexandria in the Roman province of Egypt, under the rule of the Roman Empire. From La ciencia y sus hombres : vidas de los sabios ilustres desde la antigüedad hasta el siglo XIX T. 1 [Science and it's people Vol 1] by Luis Figuier ; traducción de la tercera edición francesa por Pelegrin Casabó y Pagés ; ilustrada por Armet, Gomez, Martí y Alsina, Planella, Puiggarí, Serra, Printed in Barcelona in 1879

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