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    2-Body Fix -- take three
    From: John Karl
    Date: 2009 Nov 8, 07:42 -0800

    Starting third post on this subject because the topic switched again.
    Here's my latest take:
    It should be apparent both from Fig 7.3 and from Eqs 7.5a-e, that
    these five equations do not contain information on the zero of
    longitude.  Thus they can not determine longitude, which must be
    determined from another source -- such as the navigator.
    The navigator should label the body that is clearly off his meridian
    as GP1, the longitude reference body.  Then if this body has its LHA
    greater than 180, of course, that solution should be picked as the
    inverse cosine in Eq, 7.5e.  (We're using the convention that LHAs are
    measured westward to 360, and that west Lons are negative.  Fig 7.3
    will have its LHA2 corrected in the next printing.)
    If both bodies are too close to the ship's meridian to eyeball their
    LHA, the navigator should look around for other ones.
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