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-----Mensaje original-----
De: NavList@fer3.com [mailto:NavList@fer3.com] En nombre de George Huxtable
Enviado el: martes, 02 de octubre de 2007 10:41
Para: NavList@fer3.com
Asunto: [NavList 3319] Re: Latitude by transits of a circumpolar star both above and below the pole


George Huxtable wrote:

-- That sounds very like chapter 6 in "Spherical and Practical Astronomy", 
by William Chauvenet. Would it perhaps be an early version of that work?===

-> In Celestaire 2007 catalog there is new reprint of "A MANUAL OF SPHERICAL 
AND PRACTICAL ASTRONOMY" by William Chauvenet. I have the pdf found at google 
books, but its quality is very poor. I read only some few articles and in 
spite of the years is a very good book. George, I think it is a good book for 
my library, isn�t it?


-- It's true that it was independent of the declination, so it was useful to 
astronomers who wanted to precisely find their latitudes in the days when 
declinations in star catalogues were not necessarily to be relied on. Today, 
when star declinations are known far more precisely than any of us will ever 
need, it's of historical interest only.

-> Of course, like Lunars, sight Reduction and all the old methods used in navigation


-- I don't see how it can be in any way free from refraction errors.

-> me too. I think the article says this because at the upper culmination the 
altitude is high and the refraction small.

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