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    Re: Artificial Horizon
    From: K Chin
    Date: 1996 Nov 19, 19:38 EST

    I would like to add that instead of water in the pan try using used
    motor oil. Makes a better reflector.
    This method work quite well for practice, but remember there will always
    be motion on a boat so if possible practice doing it while you are
    sailing is best.
    On Tue, 19 Nov 1996, Jan van
    Puffelen wrote:
    > At 20:48 19-11-96 -0800, you wrote:
    > >Good evening to you all, since the nav list is a bit quiet can we have a
    > >small discussion on how to construct a artificial horizon for practice
    > >sextant work.I know they are commercialy availale to those of you in the
    > >"civilised world" but not to the likes of us in the wilds of Africa !!
    > >[lions on every corner, that's why we go to sea ]
    > >also I seem to remember reading that you don't take eye hight into account
    > >when using A H is that correct? any other things that are different ?
    > >regds alistair.
    > I have always used a simple open basin/pan etc.,  filled with ordinary
    > water. This works well for observations of the sun, the moon, some planets
    > but only the brightest stars. Apply the full index error of the sextant.
    > Divide the measured angle by two, do not apply the dip, but do apply
    > refraction, semidiameter  (if any) and Horizontal Parallax (if any).
    > The disadvantage of this method is that the maximum altitude is about 60
    > degrees (since the angle is doubled).
    > Regards,
    > Jan van Puffelen <puffelej@XXX.XXX>
    > 52d 24.5'N
    >  4d 55.0'E
    > >
    > >
    > >
    > >

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