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Point taken!  We would require an orthogonal set of lubber lines, one set on 
the inside and the other on the outside of the glass, to take care of 
parallax errors.  Of course, since Frank hasn't told us where the windows 
are, we can presume the window to be opposite the thruster.  Basically, we 
are looking at where we are pointed.  With a conveniently located star, we 
can bore sight the star (or inconveniently the angles to a series of stars) 
to orient the vehicle.

Best Regards
Brad

-----Original Message-----
From: NavList@fer3.com [mailto:NavList@fer3.com] On Behalf Of Greg Rudzinski
Sent: Tuesday, July 21, 2009 10:29 AM
To: NavList
Subject: [NavList 9166] Re: It's Moon-landing Monday


Brad,

A pair of Lubbers lines inside the spacecraft by the port hole could
be sighted through the horizon glass of a sextant to obtain a relative
bearing to a celestial body. This should help with thruster
orientation.

Greg


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