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    Re: FW: A noon sight conundrum
    From: Herbert Prinz
    Date: 2003 Nov 24, 04:58 -0500

    Kieran Kelly wrote:
    
    >  While the sun's altitude does not change at culmination its
    > progress across the sky certainly does. I do not believe it is stationary
    > for 18s.
    
    Why not? Without taking the altitude of the sun into consideration, we can
    estimate the lower limit of  the rate of change of azimuth at noon (that's when
    it changes the fastest) as 15deg/hour = 0.1deg/0.4min. The above value is well
    within this limit. More specifically, for the given altitude, multiplying 0.4min
    with cos(47.5) obtains 16s.
    
    Herbert Prinz
    
    
    

       
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