![]() It could explain why stars appear to rotate around Earth once per day and why planets move differently to stars. ![]() As stars appeared to move much slower than the planets, they were placed in the outermost sphere, furthest away from Earth, according to Lumen Learning.ĭespite the complexity of the model, this view was widely accepted for many years. The order of the solar system with regards to the geocentric model, according to Penn State University is Earth (stationary and at the center), moon, Mercury, Venus, sun, Mars, Jupiter and Saturn. They believed that the Earth was at the center with the sky or 'heavens' rotating around it in a series of layered spheres.Īccording to the educational website Lumen Learning, Ptolemy's complicated geocentric model stated that a planet moves in a small circle (known as an epicycle), the epicycle then moves around Earth in a larger circle (known as a deferent). When gazing up at the night sky from what feels like a fixed reference point and witnessing the stars and planets dance across the sky we can understand why the ancient Greeks adopted the geocentric view of the universe. ![]()
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