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If  Moon satillite orbiting information is known then as the
satillites pass over Moon features a line of position is created. A
running fix can be performed off one satillite or immediate fixes can
be obtained with two observable satellites.

On Jul 21, 7:16�am, Greg Rudzinski  wrote:
> 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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