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    Re: Alternate methods of sight reduction
    From: Frank Reed CT
    Date: 2005 Dec 9, 02:29 EST

    Hi Jim. You wrote:
    "It would seem to me that the globe device if it had  sufficient accuracy
    could be used to solve a lunar distance though I doubt the  accuracy of scales
    would allow for this."
    
    There were a number of "devices" invented and sold that would solve lunars
    this way, but they were not popular. First, they're not accurate, as you
    guessed. Second, they were fairly difficult to use (and so unless the navigator  is
    severely math-phobic, it was simpler to learn one of the various paper
    methods). Third, they were too expensive. Fourth, they required careful
    maintenance and storage.
    
    I think the same complaints, though to a lesser degree, apply to using
    globes to solve the standard celestial spherical triangle problem.
    
    -FER
    42.0N 87.7W, or 41.4N  72.1W.
    www.HistoricalAtlas.com/lunars
    
    
    

       
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