epicycle

In fact, he did this separately for the eccentric and the epicycle model.

There's nothing wrong with the standard model that a few epicycles wouldn't fix!

Oh, watchful birds of peace happy in your lonely epicycles.

For the Moon, he used a deferent and epicycle model.

Eccentrics and epicycles came to be thought of as useful fictions.

By this time each planet had been provided with from 40 to 60 epicycles to represent after a fashion its complex movement among the stars.

Other philosophers have struggled to save the conception in various ways, piling on the epicycles.

According to this notion, epicycles are regarded by some as the paradigmatic example of Bad Science.

However, the planet/center of epicycle will not move uniformly on its deferent.

When Kepler needed them in order to replace the old systems of epicycles with his own laws, those theorems sat waiting.

This is the main reason that Copernicus' system had even more epicycles than Ptolemy's.

Add enough of these "epicycles" and the predictions could be honed as precisely as you liked.

Ptolemy's epicycles could still fit the data.

An epicycle with one cusp is a cardioid.

It also contains rules for computing the longitudes of planets using eccentrics and epicycles.

Heavenly motions are uniform, eternal, and circular or compounded of several circles (epicycles).

A flash animation showing epicycles with adjustable parameters and presets for various planets.

No, the Copernican system had epicycles as well (at one point, more than the Ptolemaic models of the time).

Now they were in the heated hallway, following the stairs, rising through the building in epicycles more appropriate to the planets.

These so-called epicycles were quite numerous.

This eliminated the complex system of epicycles that both Copernicus and Ptolemy had found necessary.

Ptolemy's system involved at least 80 epicycles to explain the motions of the Sun, the Moon, and the five planets known in his time.

The three circles just constructed are also designated as epicycles of triangle ABC.

When scholars applied Ptolemy's epicycles, they presumed that each planetary sphere was exactly thick enough to accommodate them.

For one thing, their astronomers have created an elaborate system of epicycles to account for the movements of the planets.