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Was the geocentric model of Ptolemy based on epicycles and deferents?
Wiki User
∙ 8y ago
Yes it was, because the Greeks believed that the planets must follow the perfect shape, the circle.
We now know the planets travel in ellipses, but in those days Ptolemy allowed for that by introducing the idea of epicycles. An epicycle is a small circle whose centre travels round a bigger circle, and the planet travels round the epicycle.
A circle and an epicycle is a very accurate model of an ellipse provided the eccentricity factor is small, as it is for most of the planets, which is why it took over 1400 years for this concept to be questioned.
A further complication was that the Greeks believed the Earth was at the centre. We now know that the Sun is at the centre, but Ptolemy's model had to allow for the observed effects by introducing extra epicycles. For the inner planets these 'spurious' eipcycles were very large.
In the end the Ptolemaic model was very complicated, with 40-50 epicycles altogether.
Wiki User
∙ 8y ago
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Who proposed the geocentric model of the universe?
The idea first came from Aristotle, the Great philosopher of the fourth century B.C.
Who proposed the Ptolemaic universe theory?
The Greek astronomer Ptolemy (Claudius Ptolemaeus 100-170 AD) based his geocentric theory on the work by Aristotle (384-322 BC) and Aristotle's student Plato.
What is the definition for ptolemy universe theory?
late 1500s ======================== There's nothing too startling about that answer, until you consider the fact that Ptolemy died around the year AD 178. Yes, he wrote about the "geocentric" (Earth centered) theory around the year AD 150. He didn't "come up with" the theory, but he perfected it.
What is the difference between the Ptolemy and Copernicus models of the solar system?
The difference between Ptolemy's and Copernicus's model was that, Ptolemy's model had the Earth in the middle of the Solar System, with all the other planets (including the Sun and the moons) revolving around it. In Copernicus's model, he had the Sun in the center of the Solar System.
Did Galileo Galilei view the solar system geocentric or heliocentric?
Galileo made important discoveries in dynamics but he contributed little to the debate about the geocentric and heliocentric theories. His quarrel with the church caused a polarisation that was seized on by the reformed protestant church which liked to claim that the catholics were opposed to the truth. But the heliocentric theory was not shown to be the right one until about 100 years after Galileo's time.
Who proposed the geocentric model of the universe?
The idea first came from Aristotle, the Great philosopher of the fourth century B.C.
How do planets move according to the geocentric model of the universe?
A Geocentric model of the solar system would be where the Earth was at the centre of the system, while the sun and planets revolved around the Earth. We now know this not to be true, since the sun is at the centre of the solar system (Heliocentric).
Who proposed the Ptolemaic universe theory?
The Greek astronomer Ptolemy (Claudius Ptolemaeus 100-170 AD) based his geocentric theory on the work by Aristotle (384-322 BC) and Aristotle's student Plato.
Whose theory of the universe was proven wrong?
The Ptolemaic theory (geocentric) put forth by Claudius Ptolemy (100-170 AD) was based partly on the work of Aristotle. It was replaced by the Copernican theory (heliocentric) beginning around 1400 AD.
What is the definition for ptolemy universe theory?
late 1500s ======================== There's nothing too startling about that answer, until you consider the fact that Ptolemy died around the year AD 178. Yes, he wrote about the "geocentric" (Earth centered) theory around the year AD 150. He didn't "come up with" the theory, but he perfected it.
Who is the first astronomer to formulate a scientifically based geocentric cosmology of the universe?
Claudius Ptolemy, who lived in Alexandria, Egypt, from about AD 90-168, published the earliest known systematic astronomical text which described a geocentric system of celestial mechanics, called the Almagest. Ptolemy was probably familiar with the work of Aristotle entitled On the Heavens, from almost 300 years earlier, which was geocentric in the abstract but lacked a systematic approach to observational astronomy.Hipparchus of Rhodes, a contemporary of Aristotle, described a system for recording astronomical observations.Millennia earlier, Babylonian and Sumerian astronomers of the early Babylonian period (about 2000 years BC) described the motions of the planets and arithmetical rules for planetary observation.
What is the difference between the Ptolemy and Copernicus models of the solar system?
The difference between Ptolemy's and Copernicus's model was that, Ptolemy's model had the Earth in the middle of the Solar System, with all the other planets (including the Sun and the moons) revolving around it. In Copernicus's model, he had the Sun in the center of the Solar System.
Many of the advances of Renaissance cartographers were based on the work of?
pluh
Did Galileo Galilei view the solar system geocentric or heliocentric?
Galileo made important discoveries in dynamics but he contributed little to the debate about the geocentric and heliocentric theories. His quarrel with the church caused a polarisation that was seized on by the reformed protestant church which liked to claim that the catholics were opposed to the truth. But the heliocentric theory was not shown to be the right one until about 100 years after Galileo's time.
What are principle of heliocentric and the geocentric?
The geocentric principle has the Earth at the centre, while the heliocentric principle has the Sun at the centre. Modern theories of the solar system have the Sun at the centre and so are heliocentric. The earliest theories of the movement of planets among the 'fixed' stars were based on a geocentric system in which the planets moved along circles and epicycles. Copernicus's heliocentric theory also used circles and epicycles and it was seen as a parallel explanation of the planets' movements. Later Kepler used the heliocentric principle in his calculations, which were based on new and accurate measurements by Tycho Brahe. He discovered subtle effects which had previously not been noticed, that could only be explained by assuming that the planets move in elliptical orbits, and this led to his publication of the three Laws of Planetary Motion in 1609.
Who invented the geocentric model of the solar system?
i believe that was copernicus. could be galileo Aristarchus of Samos, a Greek mathematician and astronomer, was the first person (that we know of) to propose the idea that the Earth circles the Sun rather than the Sun going around the Earth. This was about 2400 years ago!
How did Copernicus contribute to astronomy?
He came up with the elegant idea that the Sun was at the centre of the Solar System and that the planets revolved around it. A slightly more technical answer: His idea was based on the simplification of the epicyclic model by Ptolemy. The Ptolemic model had many epicycles(over 70) to describe the celestial objects, whereas by putting the Sun at the centre, the number of epicycles were reduced to about 30. I thought I should mention this since this is a deep idea in physics, that nature simplifies and optimizes, more precisely Nature follows the path of least action (in rare cases maximum action). Hope my answer helped, cheers!:)
