epicycle

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Related to epicyclic: progenitive, epicyclic gear train

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).
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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 ?
Keruvannya zminamy shvydkosti za dopomohoyu nepovnoyi dyferentsial'noyi peredachi cherez satelit [Speed Change Management Via Partial Epicyclic Gear Train Through Planets].
The relevance of studying the Keplerian, epicyclic and Lense-Thirring frequencies relies on the fact that they are usually used to explain the quasiperiodic oscilation phenomena present in some Low Mass X-ray Binaries (LMXRBs).
Key words: Thick disk, Rayleigh, epicyclic frequency, and multipole.
By way of comparison, a Pratt & Whitney GTF hub-mounted epicyclic gear box is shown in Fig.
At first glance, the construction of the BHS power distribution gear is very similar to that of a standard epicyclic gear: Three planet gears are arrayed around a central sun pinion.
Epicyclic gear units can operate at up to 1% higher efficiency than a parallel shaft gear unit, and are inherently quieter than parallel shaft gear units, with lower noise and vibration [6].
So the writing was on the wall for this car, which was also suffering setbacks with its transmission, which was of a patented pedal-operated two-speed epicyclic type .
Method for making an epicyclic speed reducer, United States Patent M4838741, 06.
These were considerations taken up in the Almagest that led to Ptolemy's modifications of the epicyclic models of his predecessors, namely to the creation of the eccentric and equant models of the planets.
The flywheel is connected to the output end of the gearbox via an epicyclic gearset between the Torotrak-licensed CVT (www.
24)-(29), one can show that the orbital and epicyclic frequencies can be written as
The research engine will use an electro-hydraulic valvetrain to do this, although a cheaper mechanical system using an epicyclic gearset could also be used, and would be the company's preferred option for the future if it proves as effective, said Dave Greenwood, chief engineer for advanced technology at Ricardo.