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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

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, and
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

   

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