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    Need help to track down errors
    From: Ken Gebhart
    Date: 2008 Nov 12, 18:08 -0600

    To all List Members,
    Need help to track down errors!
    I have been made aware of  many errors on page 158 of Pub 249 Vol 2    
    Apparently all of the Hc values on the page are wrong!  For example,  
    for dec 0, LHA 0, Lat 26 (page 158), Hc is shown as 65 deg. When it  
    should be 64 deg by simple inspection.  All the other numbers are  
    also off by varying amounts as can be found by computation.  There  
    are some other errors too, of a different kind on other pages.  For  
    example, page 160.  Look at the column for dec 15 deg, and go down to  
    LHA 98.  By simple inspection you can see that there should be a  
    minus sign before Hc 00-25, but it is not there.  I believe this is  
    typical of many Hcs  near zero.
    These errors are present in the US Government Edition, privately  
    published editions, and the PDF on the NGA website.  I have spoken to  
    the UK Almanac Office, and they report that the errors do not exist  
    in their equivalent to 249 V2, or their Rapid Sight Reduction Tables,  
    and can find no trace or knowledge of them.
    I am asking anyone who has an older copy of this volume, to check it  
    for these errors and report the publication date.  Maybe we can track  
    down when they first appeared.  By the way, a friend did phone the  
    NGA to report this, and was told that �they would look into it�.
    Thanks, Ken Gebhart
    Navigation List archive: www.fer3.com/arc
    To post, email NavList@fer3.com
    To , email NavList-@fer3.com

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