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Thanks everyone for the responses. My mistake was - a so many were
quick to point out - in my Zn calculations. I had neglected to add 360
degrees to my GHA and thus arrive at a figure where Zn = Z. With an
incorrect LHA I used Zn = 360 - Z. With corrections made the fixes
were good to within a couple of miles. Making mistakes sure helps
reinforce the lessons! Now to start practicing with stars.

On Feb 6, 3:51�pm, m_bur...@MSN.COM wrote:
> Hi Mark, welcome to List. Unless I missed something would you be so
> kind as to supply the data for sight reduction? Thanks much!
> Mike Burkes
> 626-833-1521
>
> On Jan 28, 12:08�am, Watermark  wrote:
>
>
>
> > I've recently taught myself Celestial Navigation from library books
> > but I still have some newbie questions. I thought I was doing fairly
> > well using an artificial horizon - accuracy to within 6NM last week -
> > but today after taking sun sights at 10.00 and 14.00 all my LOPs ran
> > parallel. I reduced 8 different sights and double checked everything
> > but the same result. I had read that a 4 hour spread would be enough
> > but today my LHAs and Zn's all came out similar. My DR Long is 121W. I
> > can only deduce that taking sights of the sun at a similar altitude at
> > 10.00 and 14.00 caused the LHA to be too close despite 4 hours time
> > difference? Is this correct and will this always occur taking sights
> > at this time if not moving? Excuse the naivety but like I said I am
> > still a beginner.
> > Many thanks,
> > Mark- Hide quoted text -
>
> - Show quoted text -
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