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    Re: Refraction at the horizon.
    From: Marcel Tschudin
    Date: 2008 Mar 16, 11:32 +0200

    George wrote:
    >  "I have often seen a highly distorted Sun disc, at altitudes of well over 3
    >  degrees, that leads me to question it as a general rule."
    
    Frank replied:
    >  I'm going to doubt you on one detail here, George. Three degrees is six Sun
    >  diameters. Now think back... have you REALLY "often" seen a "highly
    >  distorted Sun" at six full Sun diameters away from the horizon?? In my
    >  experience, and yes, I DO look for these phenomena every chance I get, all
    >  the action occurs at much lower angular altitudes.
    
    I also was questioning George's observation. The only situation I
    could imagine he is referring to is the situation of the sun being
    partially covered by a thin cloud stripe. Different refractions at the
    upper and lower edge of the cloud result sometimes in odd-shaped sun
    images.
    
    Marcel
    
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