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  • Deferent and epicycle - Wikipedia
    The epicycles of the planets in orbit around Earth (Earth at the center) The path-line is the combined motion of the planet's orbit (deferent) around Earth and within the orbit itself (epicycle)
  • EPICYCLE Definition Meaning - Merriam-Webster
    The meaning of EPICYCLE is a circle in which a planet moves and which has a center that is itself carried around at the same time on the circumference of a larger circle
  • Epicycle | astronomy | Britannica
    In the Ptolemaic system each planet revolves uniformly along a circular path (epicycle), the centre of which revolves around Earth along a larger circular path (deferent) Because one half of an epicycle runs counter to the general motion of the deferent path, the…
  • Epicycles - EncyclopedAI
    Epicycles An epicycle (from the Ancient Greek: $\varepsilon\pi\acute {\iota}\chi\upsilon\varkappa\lambda o\varsigma$, epíkyklos, meaning “upon a circle”) is a geometric construction used in the history of astronomy to explain the apparent retrograde motion of the planets, the Sun, and the Moon relative to the fixed stars
  • Epicycles - (Intro to Astronomy) - Vocab, Definition, Explanations . . .
    Epicycles were used to explain the retrograde motion of the planets, where they appear to temporarily move backwards in the sky The Ptolemaic system, which dominated Western astronomy for over a thousand years, relied heavily on the use of epicycles to account for the observed motions of the planets
  • Planets epicycles (article) | Khan Academy
    He believed that this cyclical variation could be represented visually by mini orbits, or epicycles, revolving around larger circular orbits, or deferents The following animation shows Mars traveling around a red orbit, while the red orbit is also orbiting around the Earth on a secondary orbit
  • A161, Lecture 5 - Ohio State University
    To achieve accurate predictions of planetary positions, Copernicus adds epicycles to planetary orbits around Sun Unlike Ptolemy, he does not use epicycles to explain retrograde motions of planets Epicycles are less fundamental to the Copernican model, but still necessary
  • Ptolemaic Epicycle Machine | Harvard Natural Sciences Lecture . . .
    What it shows: Long before the time of Copernicus, the Greek astronomer Claudius Ptolemy created a model of all the planets' observed celestial motions The model involved combinations of perfect circles rotating with uniform speed
  • Epicycle in Astronomy Meaning of Ptolemy - Study. com
    Ptolemy used epicycles to try to explain the apparent change in motion of the planets within their orbits Planets appear to slow down, go in reverse, and then continue along their orbital paths
  • Epicycles - Northwestern University
    The small circle centered around Point A at the top of the figure is an example of an epicycle The idea was, the center of the epicycle (Point A) would rotate uniformly around the Earth (Object E), while the planet (Object P) would rotate uniformly around Point A





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