Ptolemaic world system

Ptolemaic world system

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Credit: DR JEREMY BURGESS/SCIENCE PHOTO LIBRARY

Caption: 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.

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Keywords: artwork, astronomy, earth-centred, earth-centred universe, historical, history of science, illustration, movement, orbits, planetary motions, ptolemaic, ptolemaic system, ptolemy, solar system, sun, universe, world

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