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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.
kp
http://www.geocities.com/TheTropics/5471
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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