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    Re: Longitude by Sunset
    From: Alexandre Eremenko
    Date: 2012 May 7, 10:01 -0400

    Greg,
    What value of refraction did you use
    for the Sun upper limb at sunset ?
    And where did you take it from?
    
    Alex.
    
    On Sun, 6 May 2012, Greg Rudzinski wrote:
    
    >
    > Grabbed a few snaps of todays sunset and low level fog and haze obscures 
    limb tangency with the horizon. I was able to get a LOP from an image that 
    has the upper limb 39.8' above the horizon using my pixel counting and 
    minutes of arc per pixel method. The intercept was 1.0' T with azimuth 
    290.7*. This is a good result considering that the Sun is so squashed. (200mm 
    lens)
    >
    > Greg Rudzinski
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