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    Re: Homemade plotting sheets
    From: Brad Morris
    Date: 2019 Dec 22, 14:54 -0500
    Cosine (53 radians) = -0.91...
    Cosine (53 degrees) =0.601...

    On Sun, Dec 22, 2019, 1:18 PM Mike Freeman <NoReply_Freeman@fer3.com> wrote:


    Thanks for your reply.

    I have 2 books on Celestial Navigation, Mary Blewitt and Tom Cunliffe. Fortunately they both use the same methods. Determine GHA/LHA and declination from the nautical almanac then enter AP3270 vol 1 2 or 3 and find your Z and intercept or Zn and intercept. So yes am using intercept method. Do not know of another and for the time being feel it is wise to learn 1 method at a time.

    I note using AP3270 vol 1 when you plot your LOP's and decide on your fix your work is not yet done. There is the matter of precession and nutation in table 5.

    I am not familiar with calculators, do not have one but found one online and tried the COS 53 and the answer is -0.918282. You get 0.6018

    What have I done wrong?



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