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What was ptolemys explanation for why the planets seemed to move at different speeds?
The planets move on little circles that move on bigger circles.
Why did Plato assume that the movement of the planets were along circles?
He was certain that all planets moved in a uniform, orderly manner, and his contemporaries figured that meant it had to be in circles because in circles there is no beginning and no end.
Where can circles be found?
coins wheels planets and so on ...
What was Ptolemy trying to explain in his model by haven't the planets move on smaller circles that move big circles?
ptolemy did something
The earth and all the planets does what around the sun?
Circle around the sun some say the sun circles the planets but it does not
Who worked out that the planets orbits are flattened circles?
Johannes Kepler, using measured planetary positional data provided by Tycho Brahe, showed that the orbits of the planets were ellipses ("flattened circles"), with the Sun at one focus of the eliipse.
What effect does the movement of the planets have as they orbit the sun?
It makes them go round in circles.
What was Copernicus' contribution to physics?
The revolution of the planets about the sun, but he wanted to use circles.
Which planets' motions were described with epicycles in the Ptolemaic system?
In the Ptolemaic system, the motions of Mercury, Venus, Mars, Jupiter, and Saturn were described with epicycles. These epicycles were small circles that the planets were thought to move in while also orbiting the Earth on larger deferent circles.
What scientist first stated that the paths of planets are ellipses instead of circles.?
Johannes 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".
How Do Planets Travel Around The Sun?
Planets travel around the Sun in elliptical orbits due to the gravitational pull of the Sun. This gravitational force keeps the planets in their respective paths, causing them to move in a continuous loop around the Sun. The speed at which a planet travels around the Sun depends on its distance from the Sun and the mass of the Sun.
