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    Re: Compass Check
    From: Don Seltzer
    Date: 2016 Mar 21, 19:48 -0400


    On Mon, Mar 21, 2016 at 6:28 PM, Bill Lionheart <NoReply_Lionheart@fer3.com> wrote:
    >
    > ... Correcting a compass with the sun. Its strange that I never learnt
    > this in a navigation class but it is clearly why binnacle compasses
    > have a spike in the middle to cast a shadow. I have an old Sestrel
    > compass with a much bigger and better spike.


    'The pilots now their azimuth attend,
    On which all courses, duly form'd, depend:
    The compass placed to catch the rising ray,
    The quadrant's shadows studious they survey;
    Along the arch the gradual index slides,
    While Phoebus down the vertic-circle glides;
    Now seen on ocean's utmost verge to swim,
    He sweeps it vibrant with his nether limb.
    Thus height and polar distance are obtain'd,
    Then latitude, and declination, gain'd ;
    In chiliads next the analogy is sought,
    And on the sinical triangle wrought:
    By this magnetic variance is explored,
    Just angles known, and polar truth restored.'

    - William Falconer

    Don Seltzer
       
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