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    Re: Pub249 etc
    From: Greg R_
    Date: 2007 Sep 9, 17:58 -0700
    > But what is the -1 degree about?
    As I understand it, when originally preparing the Polaris correction tables the thinking was that it would be easier (and perhaps less error-prone, too) if all of the corrections were done as additions (vs. mixing it up adding/subtracting), and then with 1 degree subtracted at the end as a final "correction".
    At least that's how I remember it, if I'm wrong I'm sure some of the others will chime in with the correct answer...  ;-)
    ----- Original Message -----
    From: "Ron Irwin" <ronihadlock---.com>
    Sent: Sunday, September 09, 2007 5:44 PM
    Subject: [NavList 3185] Pub249 etc

    > On my 55th birthday my wife suggested I look for an
    > opportunity to exercise my brain. As we get older
    > mental exercise becomes more impotant.  Considering my
    > love of sailing, celestial navigation seemed a natural
    > quest. With the internet I was able to discover this
    > incredible group with members of a caliber and
    > knowledge I am humbled to address. Through Schlereth,
    > Howell, Bowditch and others i have come to a grasp of
    > the process but have a few questions on
    > implementation.
    > My question is in regards to the Polaris tables  in
    > Pub 249.
    > The formula as stated in in tha Almanac  = Ho -1
    > degree + a0 +a1 + a2
    >  I understand A0 and A3, and assume A2 is reflecting
    > the oblation of the earth. But what is the -1 degree
    > about?
    > The further I get into this the more it fascinates me.
    > I especially enjoyed the Shovell  discussions.
    > Thank you,
    > Ron Irwin
    > ____________________________________________________________________________________
    > Take the Internet to Go: Yahoo!Go puts the Internet in your pocket: mail, news, photos & more.

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