What did ptolemy discover
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Quick Info
Egypt
Alexandria, Egypt
Biography
One of the most influential Greek astronomers and geographers of his time, Ptolemy propounded the geocentric theory in a form that prevailed for 1400 years. However, of all the ancient Greek mathematicians, it is fair to say that his work has generated more discussion and argument than any other. We shall discuss the arguments below for, depending on which are correct, they portray Ptolemy in very different lights. The arguments of some historians show that Ptolemy was a mathematician of the very top rank, arguments of others show that he was no more than a superb expositor, but far worse, some even claim that he committed a crime against his fellow scientists by betraying the ethics and integrity of his profession.We know very little of Ptolemy's life. He made astronomical observations from Alexa
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Claudius’ finished his first major work on astronomy was he was 50 years old. It was based on the observations he had made over the previous 20 to 30 years. He called his book, The Almagest, which meant ‘The Greatest’. In his work, Claudius described the movements of objects in the night sky using maths. He believed the paths of the stars and planets were not random. He explained them by combining several circular movements.
In Claudius' model of the Solar System, the Earth was stationary. It was surrounded by a great sphere which carried the stars, planets, Sun and Moon around the Earth. This idea of a geocentric (Earth centred) Solar System became known as the Ptolemaic system.
The Almagest also contains a star catalogue. It listed 48 constellations which could be seen from the Northern Hemisphere. Claudius' later work, ‘Planetary Hypotheses’ was more mathematical than The Almagest. It set out the Universe as a series of spheres and estimated the distances to the Sun and the 'fixed stars'.
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Ptolemy
Roman astronomer and geographer (c. 100–170)
For other uses, see Ptolemy (disambiguation).
Claudius Ptolemy (; Ancient Greek: Πτολεμαῖος, Ptolemaios; Latin: Claudius Ptolemaeus; c. 100 – 160s/170s AD)[1] was an Alexandrian mathematician, astronomer, astrologer, geographer, and music theorist[2] who wrote about a dozen scientific treatises, three of which were important to later Byzantine, Islamic, and Western European science. The first was his astronomical treatise now known as the Almagest, originally entitled Mathematical Treatise (Greek: Μαθηματικὴ Σύνταξις, Mathēmatikḗ Syntaxis). The second is the Geography, which is a thorough discussion on maps and the geographic knowledge of the Greco-Roman world. The third is the astrological treatise in which he attempted to adapt horoscopic astrology to the Aristoteliannatural philosophy of his day. This is sometimes known as the Apotelesmatika (Greek: Αποτελεσματικά, lit. 'On the Effects') but more commonly known as the Tetrábiblos, from the Koine Greek meaning "Four Book
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