epicycle

(redirected from Epicycles)
Also found in: Dictionary, Thesaurus.

epicycle:

see Ptolemaic systemPtolemaic system
, historically the most influential of the geocentric cosmological theories, i.e., theories that placed the earth motionless at the center of the universe with all celestial bodies revolving around it (see cosmology).
..... Click the link for more information.
.

epicycle

(ep -ă-sÿ-kăl) See Ptolemaic system.

Epicycle

(religion, spiritualism, and occult)

When Earth was viewed as the stationary center of the universe, the retrograde motion of the planets was explained in terms of epicycles—smaller orbits that circled in the reverse direction from the planets’ usual motion.

Epicycle

 

an auxiliary circle in Ptolemy’s geocentric system of the world.

Epicycles were introduced to explain the retrograde motions of the planets. It was presumed that a planet moves uniformly along the epicycle while its center E (see Figure 1) moves along another circle, called the deferent, with its center at the earth. Because a deferent with one epicycle could not explain many irregularities in the motions of the planets, systems of epicycles were introduced. It was believed that the center of the second epicycle moved along the first epicycle, while the center of the third epicycle

Figure 1

moved, in turn, along the second epicycle, and so on. The planet is located in the last epicycle.

epicycle

[′ep·ə‚sī·kəl]
(mathematics)
The circle which generates an epicycloid or hypocycloid.
References in periodicals archive ?
One way to address those challenges is, of course, to continue to add epicycles to the core paradigm.
In a later letter he asserted that eccentrics and epicycles "must be accepted with absolute necessity (34).
Rather than moving forward kenotically, prophetically, and mystically as witnesses to nonabsolutism, leading theologians of religions doubled back into a renewed inclusivism, thus incurring the risk of developing ever more labored and often offensive epicycles (13) for inclusivism that are increasingly implausible outside the inclusivist's hermeneutical circle.
There followed an elaborate diversionary side-debate, facilitating the perpetuation of neoclassical hegemony, akin to the epicycles of Mars envisaged to reinforce the Ptolemaic earth-centred paradigm of astronomy.
No European community felt able to hold up its head unless in its midst the planets wheeled in cycles and epicycles, while angels trumpeted, cocks crew, and apostles, kings and prophets marched and countermarched at the booming of the hours.
The plenary paper is titled "Theory of Orbits: Epicycles to Chaos.
He had shown that Ptolemy's system of epicycles, eccentrics and equants was wrong, but not that Copernicus' combinations of epicycles and eccentrics was right.
10] Nevertheless, the mathematical/cartographic import of the young discipline would survive the fictitious and hyperbolic epicycles of inflated claims to personal experience and the indulgent entertainment of a broad readership.
Most infamously, this was the case with the addition of epicycles to the Ptolemaic model in order to avoid the conclusions of Copernicus.
My sense is that Cavell's gifts are closer to his father's: his tale curves and wanders, picking up bits of personal, literary, and philosophical detritus as it coils through pages and pages of asides, doublings back, parentheses, by-the-ways, epicycles, digressions, purple patches, interruptions, and chunks of Walden and Ecce Homo, until he brings the reader to his semester with Austin at Harvard and to what he takes to be the discovery, through Austin's example, of the possibility of having a philosophical voice of the kind he has been displaying all along.
King Alfonzo X, The Learned (El Sabio), who ruled Castile in the middle of the 13th century, when studying the Ptolemaic system of astronomy with its profusion cycles and epicycles, remarked, "If the Lord Almighty had consulted me before embarking on his creation, I would have recommended something simpler.