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    Re: Cel nav in space
    From: Fred Hebard
    Date: 2005 Jan 3, 23:53 -0500

    On Jan 3, 2005, at 6:17 PM, Bill wrote:
    
    > What reference points and coordinate system(s) are used for navigation
    > of
    > spacecraft within our solar system, e.g. Earth to Moon, Earth to Mars,
    > or
    > potentially planet-to-planet, not including Earth?
    >
    > What reference points and coordinate system(s) are proposed for
    > interstellar, intergalactic travel.  How would Captain James Kirk et al
    > navigate their way through the universe?
    >
    > Thanks
    >
    > Bill
    
    
    Bill,
    
    There are some threads on this in the archives as far as solar system
    navigation is concerned.  I have never seen interstellar navigation
    discussed; my impression is that people haven't worried about that
    problem too much yet.
    
    For near Earth navigation, a geo-centric coordinate system is used,
    with radar ranging to get distance from the earth.  I can't remember
    what "horizon" was proposed for this.
    
    For interplanetary stuff, my memory fails me as to coordinate system
    and "horizon."
    
    Fred
    
    
    

       
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