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    Re: Happy Equinox Day
    From: Bill B
    Date: 2007 Mar 22, 02:24 -0400

    > From: "P F" 
    
    > Over a few minutes spanning LAN there is very little change in the
    > body's altitude - they used to say the sun tends to "hang in the sky"
    > at this time.
    >
    > So differences in recorded altitude over those few minutes are mostly
    > caused by random errors in observation. By comparing a graph of them
    > with your horizontal line it may be possible to derive a better
    > altitude to adopt for calculation of your latitude than any of the
    > recorded sights (see: "An example of a slope", 10 March 07) .
    
    Excellent point from a practical standpoint IMHO.  You may recall a long
    series pd posts on averaging years ago where the academic viewpoint claimed
    that averaging should be avoided near LAN.
    
    In extreme cases I agree. For all practical purposes given the accuracy
    claims for GHA and declination in the N.A., and sextant accuracy, what's the
    big deal?
    
    Bill
    
    
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