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    Bowditch long term almanac
    From: Geoffrey Kolbe
    Date: 2012 May 20, 10:06 +0100

    Hello Oerjan
    
    Ha! It was actually the sight reduction tables that I compiled first,
    back in the mid '80s. I thought it would be neat to publish them, but
    figured they would be much more useful if some sort of Long Term
    Almanac was included, so I compiled the LTA to go with the tables. I
    later discovered that my sight reduction tables were actually a form
    of Ageton's tables, but I have to agree with you that in my opinion
    they are "nice" and I still enjoy using them.
    
    David Burch of Starpath Publications persuaded me that a second
    edition of the LTA would be worth putting together, but with the NAO
    sight reduction tables instead of my tables as the NAO tables were
    what is (was) being used in the Power Squadron navigation classes as
    a means of sight reduction and people would therefore be familiar
    with them. So actually, the raison d'etre of the original LTA (my
    sight reduction tables) was no longer there in the second (Starpath) edition!
    
    The NAO tables do seem to be deeply unpopular. I think it is a
    combination of too many rules, which means a workform is pretty much
    essential to use the NAO tables, and a very poor explanation of the
    rules in the NA which makes the tables almost impenetrable without
    determined application on the part of the reader.
    
    I still have some of the old hardback first edition LTAs in stock for
    anyone who prefers that presentation....
    
    Geoffrey Kolbe
    
    At 09:07 20/05/2012, you wrote:
    
    >I can certainly vouch for your Almanac Geoffrey, I have had and used
    >one for several years purchased from pisces press, to be correct I
    >have purchased two from there and two from local bookstore, as I
    >have an open boat I tend to be very hard on books of any kind.
    >Sadly this last is far less useful to me as it has lost that nice
    >Sight reduction table and replaced it with something I find much
    >less userfriendly, I now have a reduced (size) version of Henning
    >Umlands smaller table in my kit.
    >
    >one place (of several) to purchase Geoffrey Kolbe's Long term almanac.
    >http://www.celestaire.com/vmchk/Learning-Celestial-Navigation/Long-Term-Almanac/vmj_estore.tpl.html
    >
    >Henning Umland's table with resolution of 1'
    >http://www.celnav.de/compact.zip
    >
    >Henning Umland's table with higher resolution 0,2'
    >http://www.celnav.de/tables.zip
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