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    Re: Irradiation
    From: John Huth
    Date: 2010 Feb 27, 12:20 -0500
    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.

    On Sat, Feb 27, 2010 at 12:14 PM, Marcel Tschudin <marcel.e.tschudin@gmail.com> wrote:
    I wonder how one would actually be able to measure this contribution
    within an environment where refraction can change easily by the same
    amount. May be taking a photo at the same moment when taking the
    navigational observation and then comparing the two results?

    Marcel




       
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