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    Re: Lat/Long by Noon Sun
    From: Gary LaPook
    Date: 2009 Apr 27, 03:11 +0200
    You might be surprised by the level of accuracy in determining the longitude from equal altitude sights: http://articles.adsabs.harvard.edu//full/1919PA.....27..359W/0000359.000.html
    http://articles.adsabs.harvard.edu//full/1919PA.....27..359W/0000363.000.html

    gl



    hch wrote:
    Hi all,
     
    I am somewhat surprised at the time and space being devoted to the subject matter. Determination of Lar/Long at or by Noon Sight, also by the way Chronometer Error, has been around long enough to have grown a full beard. I alone have used it for over 60-years with generally good results and have previously posted current examples on this List.
     
    The subject has been rather fully described and discussed by Raper, Bowditch, Lecky, and a host of others - all of whom specify rather significant restrictions, or perhaps limitations, to its use, both as respects altitude and azimuth, which are apparently ignored by the present proponents of it as a universal panacea. These factors may be presently being ignored by a denigration of the potential accuracy of the method when more rigidly applied, however, in this regard, the proponents will have to speak for themselves and I look forward to their comments,
     
    One striking difference in the method as now proposed and that traditionally employed is the graphing technique advocated to obtain the altitude at LAN. Traditionally, the Latitude was obtained by reduction to the meridian at the time of one of the sights - perhaps arguably simpler than graphing, but for the mathematically disinclined necessitating a simple table to be found in Bowditch, or elsewhere.
     
    Just a few thoughts with no argument intended..
     
    Regards,
     
    Henry
     
     





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