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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.
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∙ 15y ago
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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.
Who used 80 wheels within wheels to explain the retrograde motion of the 5 visible planets?
KEPLER
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 were epicycles used to describe?
The retrograde motion of planets
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 variation technique is used to develop the motive in measures?
Try Retrograde Motion or Diminution
What variation is used to develope the motive in measures 17-20?
Try Retrograde Motion or Diminution
What were ptolemy's accomplishments?
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.
What variation technique is used to develop the motive in the measure 17-20?
Try Retrograde Motion or Diminution
What variation technique is used to develop the motive in measures 17-20?
Try Retrograde Motion or Diminution
What was the date Ptolemy discovered retrograde motion?
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.
Who used mathematics to explain the laws of planetary motion?
Kepler
