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    Re: Henry's equal altitudes
    From: Dave Walden
    Date: 2009 Apr 26, 07:41 -0700

    From late 1800's thru early 1900's motion corrections were addressed by a 
    number of texts.  (See attached.)  They began to be addressed when "fast", 
    ocean steamers made such corrections more significant.
    
    
    
    Quoted:
    
    And:
    "The subject has been rather fully described and discussed by Raper, Bowditch,
    Lecky, and a host of others"
    
    What you are referring to is longitude by equal altitudes, generally using
    single altitudes on either side of noon, with no correction for motion of the
    observer (or changes in object declination) and no attempt to imrpove the fix
    by statistical means. Though "longitude by equal altitudes" is clearly the
    ancestor of the sorts of fixes we've been discussing, it is not the same
    thing.
    
    
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