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    Re: Old style lunar
    From: Ken Muldrew
    Date: 2004 Dec 16, 10:15 -0700

    On 16 Dec 2004 at 9:50, Alexandre Eremenko wrote:
    
    > Anyway, it is interesting to know where the advise
    > "not to measure altitudes" comes from and what was
    > the justification.
    
    This is an interesting question and one that has been discussed here
    before (though I don't recall if anyone was able to answer it
    satisfactorily). Thompson was instructed in celestial navigation by Philip
    Turnor who was one of Maskelyne's computers for the nautical almanac. It
    is hard to believe that Turnor wasn't aware of the standards of practice
    advocated by the cognescenti.
    
    I just briefly flipped through one of Peter Fidler's notebooks and out of
    25 lunars, there wasn't a single instance of an altitude exceeding 55?. So
    the idea that an artificial horizon would limit the number of altitudes
    that could be taken seems to be without merit (at least for this
    latitude). Did the inherent error of the moon's position, and the
    resulting uncertainty of any lunar, lead people to decide that measuring
    altitudes just wasn't worthwhile?
    
    Ken Muldrew.
    
    
    

       
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