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    Re: Irradiation
    From: Marcel Tschudin
    Date: 2010 Feb 27, 19:32 +0200

    On Sat, Feb 27, 2010 at 7:20 PM, Apache Runner  wrote:
    > In my case, we weren't limited by refraction.
    >
    > I had the students measure the angular height of a steeple that was only a
    > mile distant, and they systematically overestimated the height by a
    > significant amount, yet the refractive effects were small.�� I could imagine
    > that there are many ways of taking out refraction as a factor, this would be
    > one of them.
    
    OK, yes. However, remembering the difficulties the surveyors
    encountered when measuring heights, it might even have been preferable
    to do this exercise by having them measured the width of the steeple.
    
    Marcel
    
    
    

       
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