GREEKS, They are much noted for their contributions in different fields. They were not only great philosophers but great scientists and mathematicians as well., PTOLEMAIC MODEL, It claims that the planets moved in a complicated system of circles. This model also became known as the Ptolemaic System., HELIOCENTRISM, The astronomical model in which the Earth and planets revolve around the Sun at the center of the Solar System., GEOCENTRISM, Any theory of the structure of the solar system (or the universe) in which Earth is assumed to be at the center of it all., NICOLAUS COPERNICUS, He considered the sun as the stationery center of the universe. He classified Earth as a planet just like Mercury, Venus, Mars, Jupiter, and Saturn..

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