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Ptolemaic World System
12" x 16"
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Illustration of the Ptolemaic world system a model which attempted to explain the motions of the sun moon and planets and predict their future positions Earth is at the centre with its four elements earth water fire and air Originally proposed by Apollonius of Perga in the third century BC and developed by Hipparchus it was completed by Claudius Ptolemaeus of Alexandria in the second century AD Ptolemy assumed a geocentric system in which the moon Mercury Venus the sun Mars Jupiter and Saturn moved around the earth in circular orbits of increasing radius