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    Re: Beginner with inaccurate results
    From: Asbjørn Djupdal
    Date: 2005 Aug 31, 09:28 +0200

    george huxtable  writes:
    > All these problems can be avoided if a liquid horizon is used instead. Just
    > plain water, or oil, in a shallow bowl, is fine for Sun observations, but
    > not for stars. Just avoid using a shiny flat container, like a tin lid,
    > because reflections from the bottom can confuse the image. It has to be
    > kept out of the wind, to stop ruffling of the surface, and that may be a
    > problem in Trondheim; in which case, oil will do better than water.
    As Ken correctly pointed out, the Davis artificial horizon I use is a
    liquid horizon.  I have used water, but it is covered with glass so a
    little wind is not a problem.
    You say it is good for sun observations but not for stars.  I have not
    yet tried with stars, but that is a natural next step when I start to
    get good sun observations.  What would I need to do star observations
    on land?
    > Other than that correction for declination, I can find nothing wrong with
    > the rest of the calculation. I hope that with these hints from Nav-l, the
    > discrepancies will resolve.
    Yes, thanks all of you.  I learned several things, although I am still
    not sure why I get this large error.  Probably some stupid mistake,
    I'll practice more.

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