epicycle वाक्य
उदाहरण वाक्य
मोबाइल
- The model with epicycles is in fact a very good model of an elliptical orbit with low eccentricity.
- Newtonian or classical mechanics eliminated the need for deferent / epicycle methods altogether and produced more accurate theories.
- Only after Kepler's refinement of Copernicus'theory was the need for deferents and epicycles abolished.
- Shen's hypotheses were similar to the concept of the epicycle in the Greco-Roman tradition,
- Most historians of astronomy consider that this two-epicycle model reflects elements of pre-Ptolemaic Greek astronomy.
- At around 500 BC, the Greeks invented the idea of epicycles, of circles traveling on the circular orbits.
- When scholars applied Ptolemy's epicycles, they presumed that each planetary sphere was exactly thick enough to accommodate them.
- Although Copernicus'models reduced the magnitude of the epicycles considerably, whether they were simpler than Ptolemy's is moot.
- Ptolemaic model of the spheres for Venus, Mars, Jupiter, and Saturn with epicycle, eccentric deferent and equant point.
- In models of the universe that precede Ptolemy, generally attributed to Hipparchus, the eccentric and epicycles were already a feature.
- The circle acted as a deferent, carrying an epicycle along which the Moon was assumed to move in a retrograde direction.
- He naturally regarded circular motion as fundamental and then used the circular motion of deferents and epicycles in his earth-centered theory.
- However, while providing for similar explanations, the later deferent and epicycle model was flexible enough to accommodate observations for many centuries.
- Astronomers often continued using the equants instead of the epicycles because the former was easier to calculate, and gave the same result.
- :Retrograde motion was long understood ( it is easily observable in Mars ) and was exactly the stimulus for epicycles, yes.
- From ancient times until the 16th and 17th centuries, the motions of the planets were believed to follow perfectly circular epicycle ).
- But to make his system fit the observations as well as Ptolemy's system, Copernicus had to introduce still more epicycles.
- Koestler, in his history of man's vision of the universe, equates the number of epicycles used by Copernicus at 48.
- Apollonius of Perga ( c . 262 c . 190 BC ) had introduced the deferent and epicycle and the eccentric deferent to astronomy.
- The germ of the idea is to be found in ancient writers who used sundials and Ptolemaic epicycles to illustrate the divine order of the world.
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