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    Re: Compare Methods: Lat/Lon Near Noon
    From: Hewitt Schlereth
    Date: 2021 Sep 13, 16:23 -0700

    Frank, thank you very much for your apt and accurate depiction of my little work. I treasure a copy I bought years ago on Amazon Marketplace, because the almanac, and the motion-correction table, had check marks in pencil that indicated it had actually been used.

    On Sep 13, 2021, at 4:02 AM, Frank Reed <NoReply_FrankReed@fer3.com> wrote:

    Antoine, you asked:
    "is this Book title not  Latitude and Longitude by the Noon Sight ?
    From here I have identified one such Book - a "ring-bound" copy as you recommend it to be"

    That's the book. Since I originally mentioned Hewitt Schlereth's book in this thread, I feel I should explain what it is and what it is not.

    WHAT IT IS: Hewitt's book is an introductory celestial navigation manual detailing how beginners can get latitude and longitude using sights at and near noon. This is quite similar to the case that I proposed here recently (the example set up for May 22, 2022, originally outlined in this post two weeks ago, in case anyone wants to go back to the basic setup). Only basic sextant skills are required. Almost no math is required. Hewitt spells out the method and provides a basic method for the critical correction for vessel motion which can shift the longitude substantially. The book is a streamlined and well-written practical account of this technique. It also included some almanac data which, of course, has long since expired.

    WHAT IT ISN'T: This is not a theoretical book. It's not a math book. You won't find any formal justification for the methods outlined in the book because none is necessary for a practical navigator. The book is short and succinct, and it will add little to an experienced navigator's understanding of this topic. 

    [...]

       
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