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    Re: It's Moon-landing Monday
    From: Brad Morris
    Date: 2009 Jul 21, 11:53 -0400

    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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