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    Re: Longitude by Sunrise
    From: John Karl
    Date: 2010 Feb 2, 19:51 -0800

    Without a sextant and timing the green flash, why not just work up the traditional St, Hilaire LOP at zero UL observed altitude?? It's independent of an assumed latitude, which was after all, Sumner's 1837 epiphany.

    Sure the altitude corrections are a little less reliable when the sun is 50' below the horizon, but I think it's better than fussing with sunset times.

    BTW Jeremy, was the piece published in Ocean Navigator? If so, when? Currently, Ocean Nav is sitting on a short article of mine on the above zero-altitude LOP.

    JK


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