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Ancient astronmers used shell theory. The earth was center, then came the moon, planets and sun, then other stars. At first it was a circular system. It seemed more "perfect", that degenerated into ellipses as the mathematics didn't work out.
Wiki User
∙ 16y ago
Wiki User
∙ 9y agoThe Ptolemaic system held sway for 1400 years and had the Earth at the centre, with the Sun and all the planets in orbits which were based on circles. The orbits were not simple circles, but small circles (epicycles) based on larger circles. By this means the changes in distance from the Earth, especially for the nearest planets, Venus and Mars, were explained with reasonably good accuracy when compared with observations.
Wiki User
∙ 14y agoHe used his brain in a different way from the illiterate masses back in 150 A.D. in a very Astronomical way.
Wiki User
∙ 12y agoIt held that the planets moved along small circles that moved on larger circles around Earth.
Wiki User
∙ 13y agoone thing I can tell you is that they thought that the earth was flat.
Wiki User
∙ 14y agothat is unknown sorry pal
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What geometric arrangements did ptolemy use to explain retrograde motion?
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.
What was Ptolemy trying to explain in his model by having the planets move on smaller circles that move on the bigger circles?
Ptolemy is trying to explain in his model that each circle represents 1 planet's rotation and it's a scale drawing of the distance apart from each one!
What was ptolemy trying to explain in his model by having the planets move move on circles that move on bigger circles?
Ptolemy is trying to explain in his model that each circle represents 1 planet's rotation and it's a scale drawing of the distance apart from each one!
Who is ptolemy XIII?
ptolemy is a ancient astronomer who determined the law of gravitational motion
How did Copernicus explain the retrograde motions of the planets?
All the models explain retrograde motion because it is such an obvious phenomenon. In Copernicus's model an outer planet goes into retrograde motion when the inner planet overtakes it so that it appears from the inner planet to be going backwards along the ecliptic.
What geometric arrangements did ptolemy use to explain retrograde motion?
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.
Describe what produces the retrograde motion of mars. what geometric arrangement did Ptolemy use to explain this motion?
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.
What was ptolemy trying to explain in his model by having the planets move on smaller circles that move on bigger circles?
Ptolemy is trying to explain in his model that each circle represents 1 planet's rotation and it's a scale drawing of the distance apart from each one!
What was Ptolemy trying to explain in his model by having the planets move on smaller circles that move on the bigger circles?
Ptolemy is trying to explain in his model that each circle represents 1 planet's rotation and it's a scale drawing of the distance apart from each one!
What was ptolemy trying to explain in his model by having the planets move move on circles that move on bigger circles?
Ptolemy is trying to explain in his model that each circle represents 1 planet's rotation and it's a scale drawing of the distance apart from each one!
What was Ptolemy trying to explain in his model by having the planets move on smaller circle that move on bigger circle?
Ptolemy is trying to explain in his model that each circle represents 1 planet's rotation and it's a scale drawing of the distance apart from each one!
Who is ptolemy XIII?
ptolemy is a ancient astronomer who determined the law of gravitational motion
How did Copernicus explain the retrograde motions of the planets?
All the models explain retrograde motion because it is such an obvious phenomenon. In Copernicus's model an outer planet goes into retrograde motion when the inner planet overtakes it so that it appears from the inner planet to be going backwards along the ecliptic.
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.
What did Ptolemy think about the phases of Venus'?
Why would Ptolemy not explain venus phases
How can you explain retrograde motion today?
The retrograde motion of a planet is the optical illusionthat a planet reverses its orbital direction, as seen from Earth.In reality, the planet does not change direction at all, but because the Earth is also orbiting the sun, the relative motion of the Earth and another planet in their respective orbits make it appear to us as if the planet reverses course for a while.
What planet was used to explain retrograde motion?
Retrograde motion is motion in the opposite direction. In the case of celestial bodies, such motion may be real, defined by the inherent rotation or orbit of the body, or apparent, as seen in the skies from Earth.
