<span>The astronomical system of Ptolemy, in which the earth is at the center of the universe with the sun, moon, planets, and stars revolving about it in circular orbits at increasing distance. Some of the orbits have epicycles.</span>
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Hellenistic Greece was the final period in Ancient Greek History. This is the period in which Ancient Greece is called Hellenistic Greece because during this time, the city-states of Greece ultimately<span> collapsed.</span>