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クラウディオス・プトレマイオス （ 古代ギリシア語: Κλαύδιος Πτολεμαῖος, ラテン語: Claudius Ptolemæus, 83年 頃 - 168年 頃）は、 数学 ・ 天文学 ・ 占星学 ・ 音楽学 ・ 光学 ・ 地理学 ・地図製作学など幅広い分野にわたる業績を残した 古代ローマ の ...
Claudius Ptolemy. Wikipedia. Little is known about Claudius Ptolemy's life and education, other that he lived and worked in Alexandria, one of the primary centers of Greek culture in late antiquity, and that he has no genealogical relationship whatsoever to the Pharaoh dynasty bearing the same name (as believed by many in medieval times).
The Almagest is the earliest of Ptolemy's works and gives in detail the mathematical theory of the motions of the Sun, Moon, and planets. Ptolemy made his most original contribution by presenting details for the motions of each of the planets. The Almagest was not superseded until a century after Copernicus presented his heliocentric theory in ...
The Geography consists of three sections, divided among 8 books. Book I is a treatise on cartography and chorography, describing the methods used to assemble and arrange Ptolemy's data. From Book II through the beginning of Book VII, a gazetteer provides longitude and latitude values for the world known to the ancient Romans (the " ecumene ").
Ptolemy's system involved at least 80 epicycles to explain the motions of the Sun, the Moon, and the five planets known in his time. He believed the planets and sun moved around the Earth in this order: Mercury, Venus, Sun, Mars, Jupiter, Saturn. [3] This system became known as the Ptolemaic system. It predicts the positions of the planets well ...
Ptolemy I was one of Alexander the Great's most trusted generals, and among the seven somatophylakes, or bodyguards, attached to his person. He was a few years older than Alexander, and his intimate friend since childhood. He may even have been in the group of noble teenagers tutored by Aristotle.
His full name was Claudius Ptolemaeus. His greatest work was the volume known as The Almagest, which contained his astronomical data. In 13 books, The Almagest collected and extended the astronomical knowledge of Greece. Ptolemy took many of his ideas from the Greek astronomer Hipparchus. Sometimes he expanded on the earlier astronomer’s work.
