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    Re: Star-sight discrepancy
    From: T. Shanklin
    Date: 2005 Aug 24, 19:14 -0700

    I don't think it was due to Index Error or Dip.  The I.E. (determined before
    the sight, but not after) on my sextant was .8' on the arc, so I subtracted
    that from Hs.  My height of eye was 40ft, taken from the outer deck of Bolsa
    Chica State Beach Lifeguard Headquarters (N33 41 W118 03): 35ft to top of
    balcony+ 5'10" for my own height= 40ft app.= DIP corrn -6.2' also subtracted
    from Hs.  I've double checked all my calculations and have calculated it
    using a Javascript program provided on a website
    (http://www.geocities.com/CapeCanaveral/2265/sight.htm).  The only thing
    left is the horizon.  Which definetly wasn't clear.  There was a fogbank
    hanging offshore.  The eastern edge would have had to be somewhere between 3
    and 26 n.m.s offshore (I could see Oil Island Eva along with cargos lined up
    offshore outside Long Beach, but strangely only Blackjack peak of Catalina
    Is: low hanging haze/fog).  I'm thinking maybe having the horizon 'cut
    short' might have caused my error.  Plus it was hard to find my stars until
    it got pretty dark (light pollution).  So a darkening, fog obscured horizon
    shot through a whole horizon mirror (saving for a trad.).  Approximately how
    far away does fog need to be to get an accurate fix?
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