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Only Mercury, Venus, Earth, Mars, Jupiter, and Saturn.

Uranus was discovered in 1781, Neptune in 1846, and Pluto n 1930.

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Q: What planets were used in Ptolemy's and Copernicus' theories?
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How did Copernicus disprove ptolemys theory about the universe?

Shortly before Copernicus died he figured that the Earth was notthecenter of things, but the Sun was. This theory is still used today. He worked out this this theory from detailed observations of the orbit of Mars.


Contary to ptolemy what did Copernicus argue concerning the construction of the universe?

Copernicus came up with a new theory of the planets' movements among the stars in 1543. It had the Sun at the centre instead of the Earth, which was in the centre in the ancient Ptolemaic theory. Both theories used circles and epicycles to describe the planet's orbits, which they modelled quite accurately. Copernicus's theory was promoted by Galileo. The modern theory retains Copernicus's idea of placing the Sun at the centre, but it uses elliptical orbits for the planets and was devised by Kepler (1609) working with the latest observations by Tycho Brahe.


What is the similarity between the Ptolemy and Copernicus models of the solar system?

The similarity is that both theories used a system of circles and epicycles to explain how the planets move around. Copernicus's theory (1543) used a similar number of epicycles, but many of them were smaller so that the paths followed by the planets were geometrically simpler. The difference was that Copernicus placed the Sun at the centre rather than the Earth as the ancient theory had done. Another theory was later produced by Kepler (1609), which used Copernicus's idea of having the Sun at the centre, but Kepler used elliptical orbits for the planets. This new model fitted observational measurements better, but it was not until many years later after the discovery of the law of gravity and the laws of motion (1687) that it was possible to pick out Kepler's theory as the correct one that is still in use today.


How was Copernicus' model of the universe different from Ptolemy's model?

The main difference was that Ptolemy's model was geocentric (Earth-centred) and Copernicus's was heliocentric (Sun-centred). Ptolemy's model came from ancient times while Copernicus's was much later (1543). Both models represented the planets' orbits by using combinations of circles and epicycles to explain the way the planets move among the stars. Copernicus found that the orbits of the inner planets could be explained more simply. That is to say that the epicycles used for all the orbits were smaller, and for the inner planets a lot smaller. Both models represented the planets' positions with reasonable accuracy given the crude observational methods used in those days. Until gravity and the laws of dynamics were discovered about 150 years after the publication of Copernicus's system, there was no way of deciding which model was the 'right' one.


What was the the model solar system that was thought to be correct before Copernicus?

It was Ptolemy's model. Ptolemy's model came from ancient times while Copernicus's was much later (1543).Both models represented the planets' orbits by using combinations of circles and epicycles to explain the way the planets move among the stars.Copernicus found that the orbits of the inner planets could be explained more simply. That is to say that the epicycles used for all the orbits were smaller, and for the inner planets a lot smaller.Both models represented the planets' positions with reasonable accuracy given the crude observational methods used in those days.Until gravity and the laws of dynamics were discovered about 150 years after the publication of Copernicus's system, there was no way of deciding which model was the 'right' one.

Related questions

How did Copernicus disprove ptolemys theory about the universe?

Shortly before Copernicus died he figured that the Earth was notthecenter of things, but the Sun was. This theory is still used today. He worked out this this theory from detailed observations of the orbit of Mars.


Who used mathematics to prove the theories of Copernicus?

In physics, theories are not mathematically proved but instead they are compared with physical observations to see if they are correct. Copernicus's theory was not just an idea that the Sun is at the centre, but also a detailed mathematical system of circle and epicycles that provided a model of the planets' orbits. At the time of Copernicus and for a time afterwards, his theory was used to predict the planets' positions, and when the predictions were found to be 'correct', the theory was considered 'proved' . But later Tycho Brahe developed more accurate measurement techniques, and using those he discovered small errors in the predicted positions of the planets. That led to Kepler's work and the discovery of elliptical orbits.


Which scientist made highly accurate measurements that disproved the theories of ptolemy and Copernicus?

Tycho Brahe designed new equipment to measure planets' positions with unprecedented accuracy. Tycho's observations of the planets' orbits led to his alternative model which still had the Earth at the centre with the Sun orbiting it, but with the five other known planets orbiting the Sun. But Tycho's measurements were used by his assistant Kepler to produce an entirely new theory in 1609 with the planets in elliptical orbits, all orbiting the Sun as in Copernicus's model of 1543. Kepler's theory is still used today. It's important to remember that the theories of Ptolemy and Copernicus are not 'wrong', it would be better to say they are not as accurate as Kepler's theory. As models, all three of them predict the planets' positions fairly accurately.


What similarity did Ptolemy and Copernicus have about the solar system?

They were two theories that were used to predict the positions of the planets as they moved among the fixed stars. They both used planetary orbits based on combinations of circles and they were both pretty accurate. Ptolemy had the Earth at the centre while Copernicus had the Sun at the centre. They were both replaced by Kepler's theory, published in 1609, which had elliptical orbits for the planets and also had the Sun at the centre.


Who correctly viewed the planets as orbiting the sun but incorrectly used circles to describe the orbits?

Copernicus


Contary to ptolemy what did Copernicus argue concerning the construction of the universe?

Copernicus came up with a new theory of the planets' movements among the stars in 1543. It had the Sun at the centre instead of the Earth, which was in the centre in the ancient Ptolemaic theory. Both theories used circles and epicycles to describe the planet's orbits, which they modelled quite accurately. Copernicus's theory was promoted by Galileo. The modern theory retains Copernicus's idea of placing the Sun at the centre, but it uses elliptical orbits for the planets and was devised by Kepler (1609) working with the latest observations by Tycho Brahe.


What is the similarity between the Ptolemy and Copernicus models of the solar system?

The similarity is that both theories used a system of circles and epicycles to explain how the planets move around. Copernicus's theory (1543) used a similar number of epicycles, but many of them were smaller so that the paths followed by the planets were geometrically simpler. The difference was that Copernicus placed the Sun at the centre rather than the Earth as the ancient theory had done. Another theory was later produced by Kepler (1609), which used Copernicus's idea of having the Sun at the centre, but Kepler used elliptical orbits for the planets. This new model fitted observational measurements better, but it was not until many years later after the discovery of the law of gravity and the laws of motion (1687) that it was possible to pick out Kepler's theory as the correct one that is still in use today.


Did Copernicus believe in a heliocentric model?

Copernicus published an alternative model of the planets' movement in 1543 that had the Sun at the centre. It was the first heliocentric model. It used orbits based on combinations of circles, as the ancient Ptolemaic system had done, which was geocentric. In Copernicus's model the paths followed by the planets were less complicated, but other than that Copernicus had no way of proving if it was right or not at that time, so it isn't known whether he believed in it.


When Copernicus first created his Sun centered model of the universe it did not lead to substantially better predictions of planetary positions than the Ptolemaic model?

Copernicus used perfect circles for the orbits of the planets.


How was Copernicus' model of the universe different from Ptolemy's model?

The main difference was that Ptolemy's model was geocentric (Earth-centred) and Copernicus's was heliocentric (Sun-centred). Ptolemy's model came from ancient times while Copernicus's was much later (1543). Both models represented the planets' orbits by using combinations of circles and epicycles to explain the way the planets move among the stars. Copernicus found that the orbits of the inner planets could be explained more simply. That is to say that the epicycles used for all the orbits were smaller, and for the inner planets a lot smaller. Both models represented the planets' positions with reasonable accuracy given the crude observational methods used in those days. Until gravity and the laws of dynamics were discovered about 150 years after the publication of Copernicus's system, there was no way of deciding which model was the 'right' one.


What was the the model solar system that was thought to be correct before Copernicus?

It was Ptolemy's model. Ptolemy's model came from ancient times while Copernicus's was much later (1543).Both models represented the planets' orbits by using combinations of circles and epicycles to explain the way the planets move among the stars.Copernicus found that the orbits of the inner planets could be explained more simply. That is to say that the epicycles used for all the orbits were smaller, and for the inner planets a lot smaller.Both models represented the planets' positions with reasonable accuracy given the crude observational methods used in those days.Until gravity and the laws of dynamics were discovered about 150 years after the publication of Copernicus's system, there was no way of deciding which model was the 'right' one.


Explain how Copernicus concluded that stars were farther away than planets?

Copernicus concluded that stars were farther away than planets because he observed that stars did not exhibit the same apparent motion as planets. While planets appeared to move in relation to the background stars as Earth orbited the Sun, the positions of stars remained fixed relative to each other. This led Copernicus to realize that stars must be much farther away than planets.