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    Re: Digital Camera Celestial Navigation
    From: Marcel Tschudin
    Date: 2008 Jul 9, 20:23 +0300

    Paul wrote:
    > Your values are the vertical refraction. My message was about the
    > decrease in *horizontal* semidiameter due to refraction.
    
    What I tried to imagine is how the vertical refraction could possibly
    affect the horizontal diameter. But probably my starting point was
    already wrong. Even though the size of this effect is smaller than the
    accuracy I'm dealing with, I would be interested to get a rough
    "feeling" on how it is produced.
    
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