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    Re: Long-range airplane navigation
    From: Charles Seitz
    Date: 2004 Dec 2, 10:45 -0500

    I have seen references to daytime star sightings by the Astrotracker system
    that was used  to navigate the SR-71 'spyplane'.  Apparently, the system was
    completely automatic and the starlight was detected by a photomultiplier
    tube. No visual observations were required.
    
    I also recall references to a different scale for measuring the brightness
    of the stars because the spectral sensitiviy of  the auto-tracker sensor is
    different then that of the human eye.
    
    ---  CHAS
    
    
    
    
    ----- Original Message -----
    From: "Fred Hebard" 
    To: 
    Sent: Thursday, December 02, 2004 08 57
    Subject: Re: Long-range airplane navigation
    
    
    >I was asked an interesting question, which was:  could star shots be
    > made during the day with a bubble sextant?  The intent would be to get
    > more than one line of position during one round of shooting.
    
    
    

       
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