Question

what is epicycle ? Who proposed the concept of (Geocentric Model)​

Answer 1

Answer:

As a planet moved along its path, it occasionally departed from its regular motion to follow a much smaller circle centered on the orbital path itself. These smaller circles, or epicycles, were necessary to reconcile the observed motions of the planets with a geocentric model of the universe.

Ptolemy of Alexandria

Ptolemy of AlexandriaThe most highly developed geocentric model was that of Ptolemy of Alexandria (2nd century ce). It was generally accepted until the 16th century,after which it was superseded by heliocentric models such as that of Nicolaus Copernicus.

Answer 2

Answer:

In order to explain the motion of the planets, Ptolemy combined eccentricity with an epicyclic model. In the Ptolemaic system each planet revolves uniformly along a circular path (epicycle), the centre of which revolves around Earth along a larger circular path (deferent).