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    Re: Beginner Meridian Passage Question
    From: Zorbec Legras
    Date: 2004 Sep 3, 11:31 -0500

    ----- Original Message -----
    From: "Noyce, Bill" 
    Date:         Fri, 3 Sep 2004 09:13:03 -0400
    To: NAVIGATION-L{at}LISTSERV.WEBKAHUNA.COM
    Subject:      Re: Beginner Meridian Passage Question
    
    > > > b) when you think Polaris is directly below or above the pole, add
    > or
    > > > subtract its difference (which you have memorized as about 45');
    ============================
    
    Latitude by pole star.
    
    Lat = true altitude + corr 1 + corr 2.
    
    Corr 1 = Pd * Cos LHA
    Corr 2 = ((sqr Pd)/2.3438) * sqr sin LHA * tan true altitude.
    
    
    Pd = pole distance = 90 - dec.
    ============================
    
    Latitude by meridional transit.
    
    Upper transit:
    
    Lat = Zd + dec (1)
    Zd = zenithal distance (= 90? - true altitude).
    + Zd if elevated pole in your back
    - Zd if your are facing elevated pole.
    
    + dec if same name as latitude
    - dec is diff name.
    
    Lower transit
    
    Lat = 180? - (Zd + dec)
    
    ==============================
    
    Ex meridian (if you miss the transit)
    
    Vers meridional Zd = vers (90? - true altitude) - (vers LHA * cos assumed Lat * cos dec)
    with the meridional Zd use formula (1) to compute the Latitude.
    
    Vers x = versine x = sinus verse x = 1 - cos x
    ==============================
    
    About the elevated pole, have a dry gin and read it again...
    
    The elevated pole is the pole in the same hemisphere as the zenith.
    
    ==============================
    It's hard to be a hero on this planet, one to beam up...
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