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    Re: Interesting Bowditch CelNav results was : Celestial Coordinator
    From: Stan K
    Date: 2011 Dec 9, 15:56 -0500
    Kermit,

    The Bowditch reductions were done with Pub. 229.  Without running the numbers, I suspect that you did yours with the Law of Cosines, which could explain the difference.

    Stan


    -----Original Message-----
    From: Antoine Couette <antoine.m.couette@club-internet.fr>
    To: NavList <NavList@fer3.com>
    Sent: Fri, Dec 9, 2011 1:04 pm
    Subject: [NavList] Interesting Bowditch CelNav results was : Celestial Coordinator

    RE : [17565] Re: Celestial Coordinator
    From: bernecky---net
    Date: 7 Dec 2011 08:58 (see referenced post quoted at the end of this current post)

    ===========================================================================
    From Mauritius Island,
    Hello to all,

    Thanks for the referenced details about the site to upload the 2002 Bowditch Edition. I find this document excellent as usual !
    However, just for fun, I tried to quickly "rework" their Kochab-Spica example (paragraph 2006) given on pages 301 and following ones :
    The Bowditch published final results are as follows :
    Kochab Intercept : 5.2 NM towards / True Azimut 018.9 degrees , and
    Spica Intercept : 20.2 NM Towards / true Azimut 143.3 degrees.
    Working on the very same exmaple, I find :
    Kochab 11.5 T / 018.7 degrees , and
    Spica 22.1 T / 143.3 degrees .
    Quite unexpected and huge difference ...
    Am I missing something ?
    Best Regards, and thanks to whoever might shed some light here.
    Kermit
    Antoine M. Kermit Couëtte

    ===========================================================================
    Bowditch Chapter 15 Navigational Astronomy has a section that appears pertinent. Though it isn't an instruction manual, it might have enough information to reverse engineer the instructions. Bowditch is available on-line at
    http://msi.nga.mil/NGAPortal/MSI.portal?_nfpb=true&_pageLabel=msi_portal_page_62&pubCode=0002
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