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At the risk of bringing up "sun squash" again (new members can search
the archives under this thread), I can state that data from 200
photographs taken at sunset/ sunrise shows a 5% squash at 3 deg
observed elevation at SL on Std day.  Sun disk images were projected
on a wall and measured with a yardstick.  Maximum squash ever seen
was 17%.  Distortion (squash) is more easily noticed with head at 90
deg to the horizon than erect.  Don't ask me why.

Ken Gebhart
On Mar 16, 2008, at 4:32 AM, Marcel Tschudin wrote:

>
> 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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