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Hello.

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.

Asbjørn

   

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