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epicycle    
n. 本轮

本轮

epicycle
n 1: a circle that rolls around (inside or outside) another
circle; generates an epicycloid or hypocycloid


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  • Deferent and epicycle - Wikipedia
    In the Hipparchian, Ptolemaic, and Copernican systems of astronomy, the epicycle (from Ancient Greek ἐπίκυκλος (epíkuklos) 'upon the circle', meaning "circle moving on another circle") [1] was a geometric model used to explain the variations in speed and direction of the apparent motion of the Moon, Sun, and planets
  • 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)
  • EPICYCLE Definition Meaning | Dictionary. com
    EPICYCLE definition: a small circle the center of which moves around in the circumference of a larger circle: used in Ptolemaic astronomy to account for observed periodic irregularities in planetary motions See examples of epicycle used in a sentence
  • Deferent and epicycle explained
    Deferent and epicycle explained In the Hipparchian, Ptolemaic, and Copernican system s of astronomy, the epicycle (meaning "circle moving on another circle") was a geometric model used to explain the variations in speed and direction of the apparent motion of the Moon, Sun, and planet s
  • epicycle - Wiktionary, the free dictionary
    epicycle (plural epicycles) (astronomy) A small circle whose centre is on the circumference of a larger circle; in Ptolemaic astronomy it was seen as the basis of revolution of the "seven planets", given a fixed central Earth
  • Ptolemaic Epicycle Machine | Harvard Natural Sciences Lecture . . .
    How it works: The motions of the epicycle and deferent are locked together by a chain mechanism, which is hand-driven by a crank Setting it up: The epicycle machine lives on a dedicated cart and simply needs to be wheeled out of storage
  • The Mathematical Power of Epicyclical Astronomy
    Formally speaking, epicycle theory is far from being "a closed book " The famous "brachistochrone" problem introduced by Johann Bernoulli (Acta eruditorum, 1696) has affinities with epicyclical motion considered as under the influence of gravity alone
  • Epicycle - Astrodienst Astrowiki
    The so-called epicycles were an important component of the geocentric model in astronomy The epicycle theory was probably formulated by Apollonius of Perga toward the end of the third century BCE to explain the changes in speed and direction of the planets’ apparent motions in the sky
  • What Does Epicycle Mean In Science - wordssidekick. com
    An epicycle is defined as a small circle whose center moves along the circumference of a larger circle, known as the deferent This concept originated in ancient astronomy and was utilized in the Ptolemaic model to account for the retrograde motion of planets with Earth positioned at the center





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