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What geometric shape did the ancients used to describe motions of the planats?
Wiki User
∙ 13y ago
The ancients assumed that everything moved in circles. Since that didn't work very well, they assumed that the motion was in circles-within-circles, called "epicycles". That was close enough given their generally crummy measuring devices. By the 1500's, measuring devices had become accurate enough to see that planets didn't move in epicycles either.
Johanes Kepler determined that the planets move in ELLIPTICAL orbits, and we have since learned that all orbits are always elliptical.
Wiki User
∙ 13y ago
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Why did Copernicus disagree with the geocentric model?
It doesn't explain the parallax displacement IE if it is true, why don't the stars in the sky move December vs June? The Earth is supposed to be on the other side of the sun and the sky should change BUT at least with the technology of their days it didn't. If the planet is rotating at 1000 miles an hour, how come there's no wind? Why does Mars in the sky sometimes move backwards? Lastly, there was the 30 year war going on in w/c among other things the Protestants and Catholic were fighting. No point in demoralizing/distracting the troops with esoteric gobbledy gook.
