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If observed from one night to the next, a planet appears to move from West to East against the background stars most of the time. Occasionally, however, the planet's motion will appear to reverse direction, and the planet will, for a short time, move from East to West against the background constellations. This reversal is known as retrograde motion.
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What is the difference between prograde and retrograde?
Prograde motion is a counter-clockwise motion or west to east, retrograde motion is clockwise motion or east to west.
The heat death of the universe is a theoretical time in the future when the universe is supposed to?
The heat death of the universe is a suggested fate of the universe, its final thermodynamic state in which it has diminished to a state of no thermodynamic free energy to sustain motion or life.
Is speed a dominat trait?
Motion is a fundamental property of the universe, nothing is at absolute rest.
What was Isaac newtons accomplishments?
what was isaac newtons accomplsihments.? what was isaac newtons accomplsihments.?
Which of Newton's laws explain inertia?
newton's first law of motion is also known as LAW OF INERTIA. inertia is the property of a body by which every body if is in rest it tends to remain in rest and if in motion it tends to remain in motion.
How did the Ptolemaic model of the universal explain retrograde motion?
If observed from one night to the next, a planet appears to move from West to East against the background stars most of the time. Occasionally, however, the planet's motion will appear to reverse direction, and the planet will, for a short time, move from East to West against the background constellations. This reversal is known as retrograde motion.
Purpose of using epicycles and deferents to explain the motion of the planets in the night sky was to account?
Epicycles and deferents were used in early models of the universe to accurately predict the positions of planets in the sky without fully understanding the heliocentric model. They were an attempt to explain the apparent retrograde motion of planets without the advanced knowledge of elliptical orbits.
Why was retrograde motion important in astronomy?
Retrograde motion important in astronomy because it helped to explain that the planets revolved around the Sun. Retrograde motion is the ability of some objects to rotate in a direction that is opposite what is expected.
Why did Eudoxus create his solar system to explain what phenomenon?
retrograde motion
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 are the similarities beween Copernicus' model of the universe and Ptolemy's model of the universe?
Both Copernicus' and Ptolemy's models aimed to explain the motion of celestial bodies in the sky. However, Copernicus placed the Sun at the center of the universe, while Ptolemy's model had Earth at the center. Both models used the concept of epicycles to explain the retrograde motion of planets.
What was the purpose of the epicycle in the Ptolemaic model?
The epicycle in the Ptolemaic model was used to explain the retrograde motion of planets. It involved planets moving on small circular orbits within the larger orbit around Earth. By incorporating epicycles, Ptolemy was able to account for the observed motions of the planets in the night sky.
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.
Major advantage of Copernicus' Sun-centered model over the Ptolemaic model?
It offered more natural explanation for the apparent retrograde motion of planets in our sky.
What was Ptomeny trying to explain in his model by having the planets move on smaller circles that move on bigger circles?
to explain the motion of planets, especially the phenomenon of retrograde motion where planets appear to temporarily reverse their direction of motion. Ref: Andrew Liddle "An Introduction to modern Cosmology".
Why was it difficult for ancient astronomers to explain about the apparent retrograde motion?
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.
What are the contributions of Eudoxus in geocentric theory?
He created a model for the universe that explained retrograde motion if Earth was at the centre.
