Earths faster motion makes Mars appear to be going backwards, the backwards motion, in fact, is what caused retrograde motion. --Ptloemy used Epicycles to explain how geocentrical models worked.
All the classical models of Ptolemy, Copernicus, Tycho and Kepler explained retrograde motion, they had to because it is one of the most obvious of the planets' manoeuvres.
The different models had different ways of explaining it. Ptolemy's model has the Earth at the centre and uses two circles called a deferent and an epicycle to explain the movements of the planets quite accurately. The large circle is the deferent and the centre of the epicycle goes round it, then the planet goes round the epicycle. As the planet approaches Earth it appears to go backwards.
The later models with the Sun at the centre accounted for retrograde motion naturally as the Earth overtook the outer planets around the time of their closest approach (i.e. opposition).
ptolemaic used Epicycles to explain how a geocentric model worked.
The geometric that plotemy use is the Epicycles or series of concentric sphere
he used Epicycles. he thought about the earth/sun?
Retrograde motion was explained in Ptolemy's model by the use of epicycles in the planets' orbits.
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.
Epicycles
Ptomleys accomplishments were his theory was that the Earth was the center of the universe. He also used to write about different things such as astronomy, geography, and logic.
Why would Ptolemy not explain venus phases
If, as ancient astronomers thought, that our Earth was the center point of rotation for other planets, then it is difficult to explain why those planets would move in a direction opposite to their rotation. Ptolemy came up with a solution that worked, but it was a cumbersome one. Nicolae Copernicus was able to show that this retrograde motion could be explained easily if it were assumed that our Sun was the actual center of rotation of the planets.
Earths faster motion makes Mars appear to be going backwards, the backwards motion, in fact, is what caused retrograde motion. --Ptloemy used Epicycles to explain how geocentrical models worked.
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.
No, Ptolemy did.
We now understand that all the planets travel round the Sun, and a planet's retrograde motion happens as the Earth overtakes the other planet in its orbit. That was also Copernicus's view although we now use Kepler's theory, but on this point the two models are in agreement. In Ptolemy's model the Earth is stationary in the centre, and the planets move on circles and epicycles, explained as follows. Using Mars as an example and assuming the orbits of Earth and Mars are circular for simplicity, the Earth is at the centre and there is then a circle (or deferent) round it with a radius of 1.524 units. The epicycle is a smaller circle whose centre travels round the deferent in 687 days. The epicycle has a radius of 1.000 units and Mars travels round this in 365¼ days. That was Ptolemy's geometric construction to explain the motion of Mars, and the retrograde motion happens when Mars on its epicycle moves close to the Earth.
he was a polish priest scientist stated retrograde motion occured whenever earth passes around another plant gained acceptance from people had a much simpliar way to explain retrograde motion than Ptolemy
Epicycles
Ptomleys accomplishments were his theory was that the Earth was the center of the universe. He also used to write about different things such as astronomy, geography, and logic.
Why would Ptolemy not explain venus phases
If, as ancient astronomers thought, that our Earth was the center point of rotation for other planets, then it is difficult to explain why those planets would move in a direction opposite to their rotation. Ptolemy came up with a solution that worked, but it was a cumbersome one. Nicolae Copernicus was able to show that this retrograde motion could be explained easily if it were assumed that our Sun was the actual center of rotation of the planets.
Yes. We now understand that all the planets travel round the Sun, and a planet's retrograde motion happens as the Earth overtakes the other planet in its orbit. The Earth goes round more quickly than all the outer planets from Mars onwards. In Ptolemy's model the Earth is stationary in the centre, and the planets move on circles and epicycles. Using Mars as an example and assuming the orbits of Earth and Mars are circular for simplicity, the Earth is at the centre and then Ptolemy's model has a circle (or deferent) round it with a radius of 1.524 units. The epicycle is a smaller circle whose centre travels round the deferent in 687 days. The epicycle has a radius of 1.000 units and Mars travels round this in 365 days. That was Ptolemy's geometric construction to explain the motion of Mars, which it does pretty accurately, and the retrograde motion happens when Mars on its epicycle moves close to the Earth. Ptolemy used additional epicycles to allow for what we now call eccentricity in Mars's orbit, and also for what we now understand is the orbit's inclination to the ecliptic.
ptolemy did something
copernicus