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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)
  • 均輪和本輪 - 维基百科，自由的百科全书
    本輪（epicycle，源自古希臘語： ἐπίκυκλος ，字面是在圓之上，意思是在另一個圓圈之上運動的圓圈 [1] 。 。）是在天文學的喜帕恰斯、托勒密和 哥白尼日心說 （ 英语 ： Copernican heliocentrism ） 中，用來解釋月球、太陽和行星視運動的速度和方向的幾何模型。 特別是它解釋了當時已知的五顆
  • 本轮均轮系统 - 百度百科
    本轮-均轮系统，又称本轮-均轮模型，是由古希腊天文学家阿波罗尼乌斯提出（也有人认为是希帕克斯提出）的宇宙结构理论。阿波罗尼乌斯认为地球在宇宙中心，天体在不同的位置绕地球运转，但天体并不是位于以地球为圆心的轨道上，而是在其称为本轮的轨道上匀速转动，本轮的中心在以地球为
  • Epicycle | astronomy | Britannica
    …revolving, off-centre circles called eccentrics; epicycles, little circles whose centres moved uniformly on the circumference of circles of larger radius (deferents); and equants The equant, however, broke with the main assumption of ancient astronomy because it separated the condition of uniform motion from that of constant distance from
  • The Mathematical Power of Epicyclical Astronomy - Princeton University
    Indeed, by varying the revolutional speeds of the secondary epicycles, a vir- tual infinitude of bilaterally-symmetrical curves can be produced (Figure 10) Even Kepler's intractable oviform curve, to determine the equations of which he implored the help of the world's geometers,1' can be approximated quite
  • Ptolemaic Epicycle Machine | Harvard Natural Sciences Lecture . . .
    Ptolemy found that the angular rate at which the epicycle traveled was not constant unless he measured it from another point, which he called the equant Midway between the equant and the Earth is the center of the deferent, called the eccentric The angular rate at which the deferent moved around the eccentric was constant It was the use of equants to decouple uniform motion from the center of
  • Epicycle in Astronomy Meaning of Ptolemy | Study. com
    In the Ptolemaic model of the solar system, epicycles are small circular orbits that follow around much larger orbits around the Earth These larger orbits of planets and the Sun around the Earth
  • Epicycle - Solar System Astronomy
    Epicycles: Small circles used in the geocentric model to explain the apparent retrograde motion of planets Geocentric Model: Placed Earth at the center of the universe with all celestial bodies orbiting it
  • 8. 902 Astrophysics II: Lecture 05: Epicycles | Astrophysics II . . .
    8 902 Astrophysics II: Lecture 05: Epicycles Description: This file contains the notes from one individual lecture given in the course Resource Type: Lecture Notes pdf 499 kB 8 902 Astrophysics II: Lecture 05: Epicycles Download File Course Info Instructor Prof Mark Vogelsberger
  • Epicycles | Azimuth
    There are 2 more tiny epicycles associated with the Earth — the annual wobble and the Chandler wobble I have a model that associates the Chandler wobble with the lunar draconic tidal cycle via exchange of angular momentum about the ecliptic plane





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