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    Re: Calibrating a sextant scale
    From: Ken Muldrew
    Date: 2007 Nov 20, 10:46 -0700

    On 20 Nov 2007 at 12:30, Fred Hebard wrote:
    
    > Yes, for star-to-star distances, you have to correct for spherical
    > aberration when clearing the observed distance, just like the moon.   It's
    > been tried.  The problem is getting a precise star-to-star  distances.  I
    > don't believe anybody claims to have solved that  problem.  The only
    > solution seems to be to take it to somebody who  has a calibrating machine,
    > or roll your own if you have access to  tens or hundreds of thousands of
    > dollars of optical equipment.
    
    A clever method for measuring micrometer eccentricity is described in a
    message from a couple of years ago here:
    
    http://fer3.com/arc/m2.aspx?i=026728&y=200512
    
    Ken Muldrew.
    
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