Positions of places were located on this dubious grid by reducing distances measured on land to degrees.

One of the most puzzling yet long studied topics within science is optics. Ptolemy also inherited an extensive Ancient Greek tradition of observational and theoretical astronomy. However, despite Ptolemy's conventional geocentrism, his model of the solar system deviates from orthodox Aristotelism in a number of crucially important respects. As described in the Almagest, the non-orthodox (from the point of view of Aristolelian philosophy) aspects of Ptolemy's model were ultimately dictated by observations. Question: What did Ptolemy discover in the field of optics? Ptolemy was heir--via the writings of Euclid, and later mathematicians such as Apollonius of Perga, and Archimedes of Syracuse--to the considerable mathematical knowledge of geometry and arithmetic acquired by the civilization of Ancient Greece. Discovery of the Solar System This site from NASA follows the development of ideas about the solar system from Ptolemy to Copernicus to Galileo. They would center it around the Catholic Church. Will 5G Impact Our Cell Phone Plans (or Our Health?! ), The Secret Science of Solving Crossword Puzzles, Racist Phrases to Remove From Your Mental Lexicon.

Join Yahoo Answers and get 100 points today. Ptolemy actually adopted the model shown on the right in Fig. As he had put the Canaries 7° east of their true position his whole grid was thrown out of alignment. You did not specify what they discovered. Ptolemy's aim in the Almagest is to construct a kinematic model of the solar system, as seen from the earth. Secondly, Aristotle also argued--again from purely philosophical grounds--that the earth is located at the exact center of the universe, about which all heavenly bodies orbit in concentric circles. The final major work of Ptolemy, the Optics, in which he sets out and demonstrates various elementary principles, is in many ways the most successful of all his works. What did Galen base his ideas on the human body on? According to the Ptolemaic scheme, from the point of view of the earth, the orbit of the sun is described by a single circular motion, whereas that of a planet is described by a combination of two circular motions. The instantaneous position of the sun is then obtained by allowing the radius vector connecting the equant to the sun to rotate uniformly at the sun's mean angular velocity. Recentering the Universe Incidentally, the popular myth that Ptolemy's scheme requires an absurdly large number of epicycles in order to fit the observational data to any degree of accuracy has no basis in fact.



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