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    Re: Latitude at noon.
    From: Jeremy C
    Date: 2010 Feb 1, 16:55 EST
    I'll turn that around and predict that Latitude and Longitude by Noon Sun will soon be the ONLY type of sight worked by hand. Tables like H.O.229 will fade into history as those few who work LOPs complete the switch over to electronic calculation (a switch that began decades ago and is really already 99% complete). But Noon Sun will be around forever. Well... we can hope, right?


    The tables will fade into US merchant marine history, or into the hands of the fans, when the USCG ceases to require them to be used for their oceans exams.  Right now, you either use HO 229 (249 is not allowed in the room) or a regular trig calculator to do your reductions.  I tended to use both, my calculator with the formulae checked with the tabular numbers.
    I caused quite a problem in 1998 when I started using HO 249 Vol I for all of my star reductions instead of HO 229 forms.  They never expected anyone to learn that method.  The next year HO 249 was acceptable only for pre-computing stars, and not their reduction.

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