anthony morris
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Heliocentric Model

  • Came around the 1500s thanks to Copernicus
    • He realized many of the observed motions in the sky could be explained by the Earth moving around the Sun while rotating
  • Explains retrograde motion by placing the Sun at the center
    • Planets move faster the closer they are to the Sun
  • Less clumsy and has better symmetry than Ptolemy's model (geocentric model)

Space Astronomy Planetary Motion