0
Want this question answered?
Be notified when an answer is posted
Add your answer:
Earn +20 pts
Who belived that the planets move in epicycles?
Ptolemy.
Describe the deferents equants and epicycles Ptolemy used to maintain Aristotle's model while still explaining the incongruities?
phuda lai la
How did Ptolemy account for the retrograde motion in his model of the Solar system?
Ptolemy used epicycles to explain the retrograde motions of planets.Each plant was assumed to move around a small circle that turns upon a large circle.
Was the geocentric model of Ptolemy based on epicycles and deferents?
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.
The observed retrograde motion of planets led ptolemy to add blank to Aristotles system?
Epicycles
What did ptolemy invent?
geocentric model & epicycles
Who believed in epicycles?
ptolemy
How was Copernicus model of the universe different from ptolemy's?
Copernicus's model thought that the planets orbited the sun. Ptolemy's model thought that the planets orbited the moon.No. The above answer is incorrect.Copernicus's model thought that the planets orbited the sun. Ptolemy's model thought that the planets orbited the EARTH in epicycles. Not the moon. (The model that modeled the planets orbiting earth was the Geocentric model. Aristotle theorized this.)Copernicus's model is known as the Heliocentric model. Ptolemy's theory of epicycles is when the planets revolved in large circles around Earth.
How was Copernicus model of the universe different from Ptolemy's model?
Copernicus's model thought that the planets orbited the sun. Ptolemy's model thought that the planets orbited the moon.No. The above answer is incorrect.Copernicus's model thought that the planets orbited the sun. Ptolemy's model thought that the planets orbited the EARTH in epicycles. Not the moon. (The model that modeled the planets orbiting earth was the Geocentric model. Aristotle theorized this.)Copernicus's model is known as the Heliocentric model. Ptolemy's theory of epicycles is when the planets revolved in large circles around Earth.
Who belived that the planets move in epicycles?
Ptolemy.
How was Copernicus model of the universe different from ptolemys model?
Copernicus's model thought that the planets orbited the sun. Ptolemy's model thought that the planets orbited the moon.No. The above answer is incorrect.Copernicus's model thought that the planets orbited the sun. Ptolemy's model thought that the planets orbited the EARTH in epicycles. Not the moon. (The model that modeled the planets orbiting earth was the Geocentric model. Aristotle theorized this.)Copernicus's model is known as the Heliocentric model. Ptolemy's theory of epicycles is when the planets revolved in large circles around Earth.
Describe the deferents equants and epicycles Ptolemy used to maintain Aristotle's model while still explaining the incongruities?
phuda lai la
How did Ptolemy account for the retrograde motion in his model of the Solar system?
Ptolemy used epicycles to explain the retrograde motions of planets.Each plant was assumed to move around a small circle that turns upon a large circle.
Was the geocentric model of Ptolemy based on epicycles and deferents?
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.
The observed retrograde motion of planets led ptolemy to add blank to Aristotles system?
Epicycles
Why does the geocentric system use epicycles when the heliocentric does not?
The geocentric system uses epicycles in order to create a model in which the earth is in the center of the solar system and the planets and sun look the way they actually look from the earth with the naked eye. The idea of epicycles was added by Ptolemy because without them his model was not consistent with what the ancients recorded about the position of the planets, the sun and the moon. It was important that the model be consistent with observation since the model was used for navigation and land travel. Once the telescope came into being it was evident that the geocentric model (which included the epicycles) was not consistent with was now observable in the sky, such as the way that Venus looked at different times of years (the phases of Venus). Therefore the geocentric model was abandoned for the heliocentric model. The heliocentric model's predicted movements that were closer to what was observable with the new technology. The heliocentric model does not "need" epicycles, in fact they would lead to false predictions inconsistent with what was observable.
What did cladious ptolemy invent or discovered?
Claudius Ptolemy synthesized and extended Hipparchus' system of epicycles and encentric circles to ezplain his geocentric theory off the solar system.
