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In past ages astronomers accepted the Ptolemaic system. Ptolemy was a philosopher and astronomer of Greek origin and a lecturer in the University of Alexandria which was celebrated as one of the great universities of those times. He wrote a book called the Almagest in which he gathered together the theories held by ancient astronomers, systematizing these laws in a way that represents the knowledge of astronomy of that time. The book became an authority and eastern and western students used it in their colleges as a text-book. Ptolemy founded an observatory and his observations of the heavens were accepted by all the astronomers of the time.
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