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    Re: Irradiation and manual navigation
    From: Brad Morris
    Date: 2010 Mar 6, 11:33 -0500

    Interesting paper
    http://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/19680023984_1968023984.pdf.
      The statement that follows the 50 to 40 second irradiation effect for the
    moon's disk outside the earths atmosphere is very entertaining.  "...a 2.5 log
    unit neutral density filter would reduce this [the irradiation effect] to about
    zero.  The temptation to use a bright high contrast planetary disk as a target
    in navigation sightings [in space] apparently should be avoided."
    
    
    My takeaway from this is that irradiation may be present if the image isn't
    well shaded.  How would I know if the image isn't well shaded?
    
    
    Should I just continue to add shades until the image is dimly seen?  At that
    point, do we know that the irradiation effect goes to zero?
    
    
    -----------------
    
    
    I saw a show on the TV about space navigation on the Apollo mission.  The show
    focused primarily on the MIT computer and how it was designed.  However, the
    show also made several mentions of the fact that some of the Apollo astronauts
    also took observations with a space sextant.  I would expect that those
    measurements are a matter of public record and the comparison of position
    relative to the ground based telemetry derived position are available.  Now
    that would be an interesting read and certainly provide compelling evidence to
    this discussion.
    
    
    Best Regards
    
    Brad
    
    

       
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