The geocentric model is an outdated description of the solar system where the Earth is at the center of all the celestial bodies. The stars were thought to be fixed points on a celestial sphere that rotated around the Earth once a day while the planets followed complex orbits. This concept served as the predominant cosmological system in many civilizations for centuries until being replaced by the heliocentric model in the late 16th century. In contrast to geocentrism, heliocentrism claimed the Earth and other planets rotated around the Sun.
While the heliocentric model was proposed as early as 300 BC, it was not until the 16th century when a geometric mathematical model presented by Nicolaus Copernicus ushered in the Copernican Revolution. Over the course of the next century, observations by Johannes Kepler and Galileo Galilei helped solidify the heliocentric model as scientific fact. Further observations revealed that the Sun, although the center of the Solar System, was not the center of the galaxy or the Universe.
Source: http://goo.gl/6yw5jO
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