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Ptolemy
Claudius Ptolemy (Koinē Greek: Κλαύδιος Πτολεμαῖος, romanized: Klaúdios Ptolemaîos[kláwdios ptolɛmɛ́os]; Latin: Claudius Ptolemaeus; c. AD 100 – c. AD 170) was a Greek who probably lived and worked in Alexandria, Egypt.
Wereldbeeld van ptolemaeus biography
He is famous for his work on astronomy and geography. Very little is known about his personal life.
He was an astronomer, mathematician, and geographer. He described in his writing the Greek geocentric view of the universe.
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Earlier Greek philosophers changed the old assumption of a flat Earth below a "vault of the heavens". They substituted a spherical Earth surrounded by a Celestial sphere. Ptolemy built these two spheres into a system of nested spheres.
He also thought out and described the apparent motions of the planets as they were known in his time.
Ptolemy explained and extended Hipparchus's system of epicycles and eccentric circles to explain the Earth-centered theory of the world.
Ptolemy's system involved at least