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    Re: Magnetic Variation (Declination) Calculator
    From: Peter Hakel
    Date: 2009 Aug 4, 17:08 -0700
    Polaris is the one star whose SHA in my calculations differed up to 2' from almanac values (declination was fine). I suspect that it is for this very reason.  I did not check this explicitly because this is only an intermediate number that ultimately had no effect on the main result (latitude).  Apparently, while the meridian convergence at the pole works against you in getting an accurate SHA, it then compensates when you "correct" the Ho of Polaris.  Somewhat analogous to the magnetic compass issue, I suppose.


    Peter Hakel


    From: Greg Rudzinski <gregrudzinski---.com>
    To: NavList <NavList@fer3.com>
    Sent: Tuesday, August 4, 2009 4:36:54 PM
    Subject: [NavList 9351] Re: Magnetic Variation (Declination) Calculator


    Professor Manoj C. Nair of NOAA was kind enough to answer all my
    questions by email and he explained to me that due to the convergence
    of longitude at the geographic pole there will be large change in
    declination(variation) as you walk around the pole with compass in
    hand but the compass needle will be steady and unchanged as it seeks
    the magnetic pole. A simple concept that I should have been aware of.



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