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    Re: It's Moon-landing Monday
    From: Frank Reed
    Date: 2009 Jul 24, 00:01 -0700

    Greg, you wrote:
    "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?"
    
    A check on speed would be by far the most useful observation since "dead 
    reckoning" (actually numerical integration, but fundamentally the same thing) 
    works beautifully outside the atmosphere. I can't think of any non-electronic 
    spectroscopic method that would work.
    
    -FER
    
    
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