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    Re: Longitude by Sunrise example
    From: John Huth
    Date: 2010 Feb 4, 16:42 -0500
    The typical correction at the horizon is around 30-some odd arc minutes for refraction at the horizon.   The sun appears to be higher in the sky than it really is.    So, that means that the sun is visible after it has "set".   You would have to take a slightly earlier time for sunset - say when the lower limb is 15 arc-minutes above the horizon (since the diameter of the sun is approx. 32 arc-minutes).

    Or something like that....

    On Thu, Feb 4, 2010 at 4:32 PM, Marcel Tschudin <marcel.e.tschudin@gmail.com> wrote:
    Jeremy, I would like to give it an other try using the GPS data. What
    was the latitude, or did I miss it? Marcel

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