Deferent and epicycle - Wikipedia, the free encyclopedia
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In the Ptolemaic system of astronomy, the epicycle (literally: on the circle in Greek) was a geometric model used to explain the variations in speed and direction of the apparent motion of the Moo...
en.wikipedia.org/wiki/Deferent_and_epicycle
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Epicycles and Planetary Motion ... However, the Greek philosopher Aristotle (many of Aristotles works are available at the Internet Classics Archive) proposed that the heavens were literally composed of 55 concentric, ... Now, in this tortured model one sees that it is possible to have retrograde motion and varying brightness,
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csep10.phys.utk.edu/astr161/lect/retrograde/aristotle.h...
csep10.phys.utk.edu/astr161/lect/retrograde/aristotle.html
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10. The epicycle, in the Greek planetary model, is ; (a) the focus of the ellipse which is the orbit of the planet around the Earth. (b) the circle centered on the Earth, about which the centre of a smaller circle moves.
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www.astro.utoronto.ca/~ast210/test2.html
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Models of Planetary Motion from Antiquity to the Renaissance ... The epicycle on deferent model is quite flexible. By adjusting the size of the epicycle, Ptolemy could fit his model to the size of the retrograde loops observed in the heavens. ... University of Chicago Press, 1992. G.E.R. Lloyd, Early Greek Science:
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faculty.fullerton.edu/cmcconnell/Planets.html
faculty.fullerton.edu/cmcconnell/Planets.html
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In a Greek papyrus of the second century A.D. there is evidence of a planetary model of epicyclic type in which the planet travels on the epicycle in the opposite direction to that correctly adopted by Ptolemy.
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www.gap-system.org/~history/Printonly/Aaboe.html
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Biography of Asger Aaboe (BB^Y-2007) ... In a Greek papyrus of the second century A.D. there is evidence of a planetary model of epicyclic type in which the planet travels on the epicycle in the opposite direction to that correctly adopted by Ptolemy.
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www-history.mcs.st-andrews.ac.uk/Biographies/Aaboe.html
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This was in contrast with the Greek planetary model of Ptolemy, where the planes of all planetary orbits intersected at the earth and it became impossible to cap-ture even the basics ... S. Madhavan (Thiruvananthapuram) explained how the variable epicycle model given in the Suryasiddhanta for the manda process,
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www.iisc.ernet.in/currsci/jul252000/MEETING%20REPORTS.p...
www.iisc.ernet.in/currsci/jul252000/MEETING%20REPORTS.pdf
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The second construction, the epicycle, is geometrically equivalent to the simple movable eccentric. In this case, ... Typical Ptolemaic planetary model(From Michael J. Crowe, Theories of the World from Antiquity to the Copernican Revolution.); [click for larger image] ... Its original Greek title is Mathematical Syntaxis.
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galileo.rice.edu/sci/theories/ptolemaic_system.html
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Sep 19, 2009 ... Some Greek astronomers (e.g., Aristarchus of Samos) had ... The first planetary model without any epicycles was that of Ibn Bajjah ...
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wapedia.mobi/en/Deferent_and_epicycle
wapedia.mobi/en/Deferent_and_epicycle
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