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    Re: Lunars Tables
    From: Frank Reed
    Date: 2007 Dec 03, 21:55 -0500

    Andres Ruiz you wrote:
    "Both with the best method for clearing a lunar distance, for me: the 
    Young�s formula." 
    
    Ya know, unless you get into historical things, like working out the 
    calculation by logarithms or maybe using tables of so-called "logarithmic 
    differences," there's really no meaningful difference between "Young's 
    formula" and the common cosine formula. They differ only by a trig identity. 
    Once you put these calculations on a computer, they are identical (except 
    for a very small difference in computation time, on the order of one 
    microsecond for each cleared lunar). 
    
    The attention given to Young's formula in Cotter's "History of Navigation 
    and Nautical Astronomy," and repeated by some who have read that book, is 
    completely out of proportion to its significance. Young's formula is a 
    footnote in the history of lunars. This mistaken attention appears to be due 
    to the fact that Cotter focused on publications from the period when lunars 
    were obsolescent --post-1850. 
    
     -FER
    
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