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    Re: Old Navigation Techniques
    From: Dan Hogan
    Date: 1998 Jul 22, 10:42 AM

    Everything I have read about Columbus seems to indicate that he had
    trouble dealing with the math and procedures for a Noon Sight let
    alone the calculations needed for Lunars. The first suggestion for
    using Lunars seems to have been by the astronomer John Werner of
    Nuremberg in 1514.
    Robert H. Fuson in "The Log of Christopher Columbus, International
    Marine, 1987, ISBN 0-87742-951-0", says that Columbus carried a
    Quadrant and possibly a Backstaff. He tried the Quadrant 5 times and
    found it at variance to his DR. Since Columbus was of the loxodrome
    school of DR navigators who followed 32 points of the compass he
    didn't have a need for knowledge of his latitude beyond 2 to 3
    degrees since he was following the compass. Then too, he also kept
    time with an Hour Glass. How, do you do Lunars with an hour glass???
    His estimate of the circumference of the earth was too small,
    intentional or not. Also at the end of the 16th century charts still
    showed Venice too far north by three degrees and Genoa by two
    He did it by DR and LUCK.
    Dan Hogan WA6PBY
    "Gacha" Catalina 27
    San Pedro, CA
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