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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 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".
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.
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.
What were epicycles used to describe?
Epicycles were used in ancient astronomy to explain planetary motion within a geocentric model. They involved the idea of planets moving in small circles (epicycles) while also moving along a larger path around the Earth.
What was Ptolemy trying to explain in his model by having the planets move on smaller circles that move on the bigger circles?
Ptolemy proposed the use of epicycles (small circles) within deferents (larger circles) to explain the observed retrograde motion of planets. The epicycles were used to account for the variability in a planet's speed as it moved along the deferent in his geocentric model.
What variation is used to develope the motive in measures 17-20?
Try Retrograde Motion or Diminution
Does Earth go into retrograde?
Oh, sweetheart, Earth doesn't go into retrograde like some of the other planets do. We just keep on spinning in our regular orbit around the Sun, bringing us all the beauty and wonders of nature every day. Just trust the universe's gentle rhythm - there's magic in every little transitions.
What variation technique is used to develop the motive in measures 17-20?
Try Retrograde Motion or Diminution
What variation technique is used to develop the motive in the measure 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.
