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I have a Norie's Nautical tables from 1964 which gives a position for
Trondheim of  63 27 N  09 44 E
Compare this with what Asbjorn gave us: 63 25,4 N 10 24.7 E
May-be Asbjorn took his GPS position from a list as did  both Geoffrey Kolbe
and George Huxtable.

The point I want to make clear is that this mystery about Asbjorn's big
discrepancy might be explained from a mistake in the starting position.

Thanks George for your warm welcome; I will try to contribute to the
dicussions whenever possible

Willem Piccer

----- Original Message -----
From: "george huxtable" 
To: 
Sent: Sunday, September 11, 2005 12:04 AM
Subject: Re: Beginner


> Geoffrey Kolbe wrote-
>
> >At 18:13 10/09/2005, Willem Piccer wrote:
> >
> >>I was just re-reading the discussion on the problems Asbjorn had and I
> >>wonder if the whole problem is not caused by the gps position used.
> >>Especially because he states that the observation height is always less
> >>than the calculated height.
> >>I have the feeling that the chart datum chosen plays a role
> >>
> >>Willem Piccer
> >
> >
> >The latitude and longitude which Asbjorn's GPS deduces for Trondheim
(where
> >Asbjorn says he took the sights) agree with that given in various atlas's
> >and gazetteers that I have to less than a minute. A glance at the atlas
> >shows that a position five miles North and East of Trondheim (where
Asbjorn
> >would have to be to get an observed altitude 5 minutes less than
> >calculated) would put him in Trondheims Fjord....!
> >
> >Asbjorn would appear to be where he thinks he is.
>
> Response from George-
>
> Not necessarily so. He would not have to be at the place that Geoffrey has
> specified, to get an observed altitude 5 minutes less than calculated.
> Anywhere on a position line passing through that point, and perpendicular
> to the Sun's azimuth, would fit his observation. So he would not have to
be
> in Trondheim's Fjord. Still, it would be useful if Asbjorn would confirm
> (or not) whether that GPS position corresponds well to his place of
> observation.
>
> There remains something of a mystery about Asbjorn's big discrepancy, in
> what should be a very accurate observation. Perhaps he will repeat his
> measurement, next time the Sun shines in Trondheim, and before it gets too
> low to observe well from his Northerly latitude.
>
> And I would like to welcome Willem Piccer's first contribution to this
> list, from Zeeland, Holland.
>
> George.
>
>
> ===============================================================
> Contact George at george@huxtable.u-net.com ,or by phone +44 1865 820222,
> or from within UK 01865 820222.
> Or by post- George Huxtable, 1 Sandy Lane, Southmoor, Abingdon, Oxon OX13
> 5HX, UK.
>

   

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