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    Re: Cel nav in space
    From: Charles Seitz
    Date: 2005 Jan 5, 11:29 -0500

    A descripton of coordinate systems for space navigation:
    Two Voyager space probes launched during the 70's are still on the JPL
    active mission list and NASA schedules regular communications sessions with
    them.  They currently are well past the orbit of Pluto and may be considered
    to be in intersteller space.
    I have been considering asking the space navigators at NASA if they have
    noticed any anomolities in their trajectories as the gravitational influence
    of the sun deminishes. According to Einstein, space can actually be shaped
    gravity fields.
    Maybe we might have enough knowledge navigate about our Milky Way galaxy
    but heading out to explore another galaxy who be a greatest venture into the
    unknown since Columbus sailed over the 'edge of the earth'.
    We would need to travel there at light speed, if that's possible. Would
    sightings need to be corrected for relativistic effects?  How will we
    sightings for light being bent around black holes?
    ---  CHAS
    ----- Original Message -----
    From: "Fred Hebard" 
    Sent: Monday, January 03, 2005 23 53
    Subject: Re: Cel nav in space
    > 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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