Earth revolves in eliptical path?

  1. Dec 30, 2012 #1
    hi , how earlier scientist figure out that earth has elliptical motion rather than circular around sun?
     
  2. jcsd
  3. Dec 30, 2012 #2

    mfb

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    Re: earth revloves in eliptical path?

    You can track the relative position of earth and sun relative to stars - the orbital speed depends on our distance to the sun, if that changes the orbit has to be a (true) ellipse.
    You can use observations of other planets as well, but that is tricky as those move significantly within a year.
     
  4. Dec 31, 2012 #3
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