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Which planets' motions were described with epicycles in the Ptolemaic system?
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∙ 12y ago
All the known planets
Wiki User
∙ 12y ago
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What was the purpose of the epicycle in the Ptolemaic model?
Epicycles helped account for the apparent motion of the other planets in the geocentric model.
This scientist compared the motions of electrons in atoms to the motions of planets orbiting the sun?
Niels Bohr.
Purpose of using epicycles and deferents to explain the motion of the planets in the night sky was to account?
retrograde motion
Which scientists described the universe and what were their theories?
Claudius Ptolemy and Nicolaus Copernicus both described the universe. Ptolemy, a Greek astronomer, wrote a book that combined all knowledge of astronomy that he could find. He expanded ancient theories with careful mathematical calculations in what was called the Ptolemaic Theory. Ptolemy thought the Earth was the center of the Universe and that the sun and other planets revolved around Earth. Although this theory was incorrect as we now know, it predicted motions of the planets better than any other theory at the time did. Copernicus, a Polish astronomer, published a new theory that would eventually revolutionize astronomy. Copernicus thought the Sun was the center of the universe, and all the planets (including Earth) orbit the sun. Although Copernicus correctly thought that the planets orbit the sun, his theory did not replace Ptolemaic theory immediately. When Copernicus's theory was accepted, major changes in science and society called the Copernican revolution took place.
What is the orbit of a planet called?
The motion of the planets are elliptical motions
What was the purpose of the epicycle in the Ptolemaic model?
Epicycles helped account for the apparent motion of the other planets in the geocentric model.
Did Kepler accurately described the motions of all the known planets?
yes
Why WAS THE PTOLEMAIC THEORY ACCEPTED FOR LONG TIME?
Because the theory had predicted the motions of the planets better than any known method at that time.
Who belived that the planets move in epicycles?
Ptolemy.
Lets us see flaws in the ptolemaic model of the universe What is its basic flaws?
It fails to describe the basic motions of the planets without a number of "arbitrary" actors. It fails to describe the now-observed motions of the host of stars around us.
What were epicycles used to describe?
The retrograde motion of planets
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.
What was the old Ptolemaic conception of the universe?
The Earth was the center of the universe and the "heavenly bodies", such as the moon, sun, planets and stars, rotated in their own spheres around the Earth in a pattern. The order of spheres from Earth outward are:MoonMercuryVenusMarsJupiterSaturnFixed starsSphere of Prime Mover
Why do planets look like they are moving backwards as we view them from earth?
Their called epicycles
The observed retrograde motion of planets led ptolemy to add blank to Aristotles system?
Epicycles
This scientist compared the motions of electrons in atoms to the motions of planets orbiting the sun?
Niels Bohr.
Did Tycho Brahe came to the wrong conclusions about motions of the planets. true or false?
did Tycho Brahe came to the wrong conclusion about motions of the planets. true or false?
