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Pages from 1550 Annotazione on Sacrobosco's De sphaera mundi, showing the Ptolemaic system. In the Ptolemaic system, each planet is moved by a system of two spheres: one called its deferent; the other, its epicycle. The deferent is a circle whose center point, called the eccentric and marked in the diagram with an X, is distant from the Earth.
Notable features of Ptolemy's map is the first use of longitudinal and latitudinal lines as well as specifying terrestrial locations by celestial observations. The Geography was translated from Greek into Arabic in the 9th century and played a role in the work of al-Khwārizmī before lapsing into obscurity. The idea of a global coordinate ...
The term might be used, for example, to describe continuing to try to adjust a theory to make its predictions match the facts. There is a generally accepted idea that extra epicycles were invented to alleviate the growing errors that the Ptolemaic system noted as measurements became more accurate, particularly for Mars.
Nederlands: The Ptolemaic system is an ancient astronomical model that posits the Earth as the center of the universe, with the planets, the Sun, and the stars orbiting around it in a series of concentric circles.
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Art found outside of Egypt itself, though within the Ptolemaic Kingdom, sometimes used Egyptian iconography as it had been used previously, and sometimes adapted it. [43] [44] For example, the faience sistrum inscribed with the name of Ptolemy has some deceptively Greek characteristics, such as the scrolls at the top. However, there are many ...
Through the use of telescopes other celestial objects like the classical planets were found, starting with the Galilean moons in 1610. Today the term planet is used considerably differently, with a planet being defined as a natural satellite directly orbiting the Sun (or other stars ) and having cleared its own orbit.
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