References
[WWW Document] URL http://www.ithaca.edu/hs/physics/physics4/PH174/N04-GeocentricModel. html
[WWW Document] URL http://www.usd.edu/phys/courses/astronomy/notes/explanations/index. htm
Edward L. Wright (1997): Solar System Cosmology [WWW Document] URL http://www.astro.ucla.edu/~wright/solar_system.htm
Lutgens, Frederick K. and Tarbuck, Edward J. "Earth's Place in the Universe."
Earth Science
. New Jersey: Prentice-Hall, Inc., 1997
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