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    • Diagram of Ptolemy’s model (geocentric) with Earth at the centre
    Rights: University of Waikato. All Rights Reserved. Published 27 March 2013 Size: 81 KB Referencing Hub media

    Ptolemy’s model (geocentric) places the Earth at the centre of the Universe. The Sun and planets revolve in a series of circular orbits moving out from the Earth.

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      History of satellites – timeline

      See some key dates relating to early discoveries about natural and artificial satellites in this timeline. 6th century BCE – Ancient Greek geocentric model Ancient Greek astronomers believe the ...

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