The Planets Today


His careful observation of a comet led him to the conclusion that the comet’s orbit couldn’t be circular; however despite this insight, he was unable to desert the geocentric system. Instead, he proposed a model which preserved the ancient geometric structure, but advised that every one the planets except the Earth revolved across the Sun. The Sun, nevertheless, in accordance with the geocentric view, carrying all of the planets with it, nonetheless moved concerning the Earth. To clarify the motion of the planets, Greek astronomers, whose efforts culminated within the work of Claudius Ptolemy (c. A.D.), devised difficult fashions during which planets moved along circles (epicycles) that had been superimposed on round orbits about the Earth. These geocentric models have been capable of clarify, for example, why Mercury and Venus by no means transfer greater than 28° and 47° respectively from the Sun.

British Dictionary Definitions For Heliocentric

Ancient astronomers … Read More