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This is rigorously true, but it dodges the question that I think people meant 
to ask, vis: If the local vertical (gravitationally determined) doesn't point 
to the center
of the earth or the celestial sphere, then where is the position so measured?

I can't read a sextant well enough on a small boat so the answer matters, and 
I would be skeptical if anyone else claims he can. But that is the question, 
isn't it?



On Thu, 24 Jan 2002 12:23:38 -0500, daveweilacher@earthlink.net wrote:

>It is the
>ZENITH that the navigator is attempting to locate in the celestial
>sphere. Once that has been accomplished, he projects it down via the
>local vertical, simply by renaming declination latitude, and GHA
>longitude, and calls it his  position . This works on an egg, a pear, a
>lemon or an onion.
>


Rodney Myrvaagnes                   J36 Gjo/a

   

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