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    Ex-Meridian Altitude
    From: Doug Royer
    Date: 2004 Oct 11, 10:28 -0700

    I would appreciate any help by members of the list who are versed in
    mathimatics.Perhaps members who are versed in antiquated celestial
    procedures could help too.
    I have been collecting old navigation books this past year and finally got
    around to inspecting the contents of a couple of them.
    Of the 3 seperate volumns I have the newest one was printed in 1923.The next
    oldest one was printed in 1916.I've yet to get to the book printed in 1909.
    Here is my question:
    In the book printed in 1916 the chapter on finding latitude by the
    Ex-meridian procedure has the following passage:
    "While ex-meridians are retained the "Phi-Prime" and the "Phi-Second" sight
    is omitted.It has no longer any practical value since the St. Hiliare method
    accomplishes all that it used to."
    The chapter dealing with ex-meridian sight procedures in the 1923 book has
    no referance to the above at all.
    I haven't had time to yet read the 1909 book to see if the above is
    mentioned.
    My questions to you guys are : What is the author trying to tell me? What is
    the "Phi-Prime" and "Phi-Second" ?
    Thanks in advance.
    
    
    

       
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