The Celestial Sphere and Time

  • Gerald North


The Greek philosopher Ptolemy summarised the ancient view of the structure of the Universe in about AD 140.This view placed the Earth at the center of the Universe with the Sun, Moon, planets and stars attached to crystal spheres, concentrically arranged, that revolved about the Earth.


Great Circle Celestial Body Cardinal Point Local Solar Time Sidereal Time 
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Copyright information

© Springer-Verlag London 2003

Authors and Affiliations

  • Gerald North

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