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    Re: Azimuth Formula Questions
    From: Doug Royer
    Date: 2005 Nov 1, 15:23 -0800

    Doug Royer wrote:
    > I learned and then started to use HO-211 on a regular basis. 28 pages of
    > data covers just about everything to reduce sights. But that is all it is
    > capable of doing. It can't compute GC sailings etc
    Bill Noyce wrote:
    I'm confused.  HO-211 should be able to compute GC sailings, sight
    predictions, and
    star identification just as well as HO-229 (though just like sight
    reduction, it takes more
    steps).  For GC sailings, you of course use longitude difference as the LHA,
    60*(90d-Hc) is the resulting distance.  For star identification, the
    trick is to use observed
    azimuth as the LHA, and observed altitude as the declination; the
    resulting Hc and Z
    are then the star's declination and LHA, respectively.  (I've probably
    fumbled this a bit,
    but doing this with HO211 is fundamentally the same as doing it with
    the tabular methods.)
        -- Bill
    I never thought of it like that. Perhaps(most likely)you're correct. I'm not
    a great thinker when it comes to navigation theory/methods. I'd rather do it
    than sit around and think about it. So if something(procedure or extra
    method of using something)isn't written or I don't see it explained I don't
    waste time thinking how something can be used for a different application
    than what it was designed.
    I am definitely going to check what you explained concerning using HO-211
    out directly to see if it feasible using your explaination. An extra use for
    an already very useful 28 pages. Thanks for bringing it to my, and anyone
    who didn't know, attention.

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