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the planets were attached, not to the concentric spheres themselves, but to circles attached to the concentric spheres, as illustrated in the animation. ... These circles were called Epicycles, and the concentric spheres to which they were attached were termed the Deferents...
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www.phys.unt.edu/Astronomy/online_course_files/sample_p...
www.phys.unt.edu/Astronomy/online_course_files/sample_pages/04_1.html
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(1) EPICYCLES AND DEFERENTS: ... Sorry, your browser does not show Java applets ... For this initial display, the rotation of the deferent has been stopped by setting the "rotation ratio" to 0. This is the ratio of the angular velocity of the deferent to that of the epicycle. To display, press the "Start" button.
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physics.syr.edu/courses/java/demos/kennett/Epicycle/Epi...
physics.syr.edu/courses/java/demos/kennett/Epicycle/Epicycle.html
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The solution to retrograde motion was to use a system of circles on circles to explain the orbits of the planets called epicycles and deferents. The main orbit is the deferent, the smaller orbit is the epicycle.
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abyss.uoregon.edu/~js/ast121/lectures/lec02.html
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However, the epicycles of all three planets are the same size. Moreover, the epicycle radius vectors, , of all the superior planets point in the same direction (i.e., the direction of the Sun relative to the Earth) at all times.
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farside.ph.utexas.edu/syntaxis/syntaxis/node12.html
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Reconstruction of a planet's bizarre orbit with Ptolemy's system of epicycles and deferents. Reconstruction of a planet's bizarre orbit with Ptolemy's ...
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www.youtube.com/watch?v=QVuU2YCwHjw
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Further, epicycles and deferents were CIRCLES, not spheres." ... Second, epicycles and deferents definitely WERE spheres according to quite a few major ...
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www.amazon.com/gp/cdp/member-reviews/A209GG3TCADABS
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Demonstrating a geocentric model ... The following animation shows a simplified geocentric model with three objects: the Earth (blue) in the centre with the Sun (yellow) and Mars (red) in circular orbits around it. Mars travels on an epicycle which is ... You can stop the planet motion by clicking on the image at any time,
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www.astro.utoronto.ca/~zhu/ast210/geocentric.html
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He realized, as had Hipparchus, that the inequalities in the motions of these heavenly bodies necessitated either a system of deferents and epicycles or one of movable eccentrics (both systems devised by Apollonius of Perga, the Greek geometer of the 3rd century BC) in order to account for their movements in terms...
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zebu.uoregon.edu/~js/ast221/lectures/lec06.html
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In astronomy, Cremonini repudiated not only Copernicus, but all mathematical innovations since Aristotle, rejecting even the epicycles and deferents of Ptolemy in favor of Aristotle's simple cosmology of homocentric spheres.
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www.thefreedictionary.com/Deferents
www.thefreedictionary.com/Deferents
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