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Ptolemy inherited from his Greek predecessors a geometrical toolbox and a partial set of models for predicting where the planets would appear in the sky. Apollonius of Perga ( c. 262 – c. 190 BC ) had introduced the deferent and epicycle and the eccentric deferent to astronomy.
Κλαύδιος Πτολεμαῖος Klaudios Ptolemaios; ur. ok. 100, zm. ok. 168) – astronom, matematyk i geograf pochodzenia greckiego [1]. Urodzony w Tebaidzie, kształcił się i działał w Aleksandrii należącej wówczas do Imperium rzymskiego około II wieku n.e. [2].
In astronomy, the geocentric model (also known as geocentrism, often exemplified specifically by the Ptolemaic system) is a superseded description of the Universe with Earth at the center. Under most geocentric models, the Sun , Moon , stars , and planets all orbit Earth.
19 lis 2024 · Ptolemy made contributions to astronomy, mathematics, geography, musical theory, and optics. He compiled a star catalog and the earliest surviving table of a trigonometric function and established mathematically that an object and its mirror image must make equal angles to a mirror.
7 wrz 2023 · In Ptolemy's model of the universe, Earth was considered the centre of the cosmos, with the Sun, Moon, planets, and stars revolving around it in uniform circular orbits as they travel through a substance labelled aithêr.
Ptolemy offered explanations for many phenomena concerning illumination and colour, size, shape, movement and binocular vision. He also divided illusions into those caused by physical or optical factors and those caused by judgmental factors.
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 80 epicycles to explain the motions of the Sun, the Moon, and the five planets known in his time.
