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    Re: Longitude by Sunset
    From: Alexandre Eremenko
    Date: 2012 May 7, 12:27 -0400

    What will your Palm Pilot show for refraction if you enter altitude=0 ?
    
    Alex
    
    On Mon, 7 May 2012, Greg Rudzinski wrote:
    
    >
    > Alex,
    >
    > -26.4' is what my Palm Pilot Software used for refraction. The Henning 
    Umland online sight reduction produces the same intercept value if 50 F is 
    entered for temperature. At a temperature of 70 F then the intercept 
    increases to 1.1' (see attachments). The ocean temperature here is 60 F and 
    the air temperature was 70 F at the time of the observation. Lots of strange 
    mixing goes on at the surface of the ocean so inconsistencies should be 
    expected.
    >
    > Greg Rudzinski
    >
    >
    > [NavList] Re: Longitude by Sunset
    > From: Alexandre Eremenko
    > Date: 7 May 2012 10:01
    > 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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    > Attached File: http://fer3.com/arc/img/119444.picture-113.png
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    > Attached File: http://fer3.com/arc/img/119444.f1-picture-137.png
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