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    Re: It's Moon-landing Monday
    From: Greg Rudzinski
    Date: 2009 Jul 21, 07:16 -0700

    Frank,
    
    Orbiting Moon satellites could be used to check spacecraft velocity/
    position using doppler shifts of reflected light. Would a spectroscope
    be of any use for this?
    
    Greg
    
    On Jul 21, 1:00�am,  wrote:
    > Greg, you wrote:
    >
    > "It seems that a 2009 PDA is sufficient to handle trajectories, 
    triangulations and three dimensional cross track error with optimal thrust 
    applications to rendezvous or orbit."
    >
    > Yes, it sure would be good enough for the calculations. I proposed a laptop 
    in case anyone wanted to bring the entire Hipparcos star catalog or maybe a 
    complete topographic map of the Moon at ten-meter resolution (this doesn't 
    exist yet, but it will be available very soon).
    >
    > Some things to consider:
    > There are lots of satellites orbiting the Earth. Could you use them for 
    anything? By 2029, there would probably be a dozen satellites orbiting the 
    Moon. Any use for them? And finally, as it seems to me, the big difference 
    between terrestrial celestial navigation and this "space" navigation is that 
    you can see thousands of stars 24 hours a day (unless your spacecraft is 
    surrounded by clouds of ice particles, as during Apollo 13). If you think 
    about it, that changes everything. What could you do while approaching the 
    Moon if you could see tenth magnitude stars on its limb?
    >
    > -FER
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