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    Re: Sight Reduction Formula
    From: Ralph Clampitt
    Date: 2003 Oct 20, 11:01 -0800

    Jan,
    
    Yes a mistake in transcribing the cosine formula for azimuth that I said I 
    found most commonly referenced.  Very sorry about that.
    
    Should have been "cos Z = sin Dec - (sin Hc * sin LAT)/(cos Hc * cos LAT)".
    
    Ralph Clampitt
    
    -----Original Message-----
    From: Jan Kalivoda [mailto:jan.kalivoda{at}FF.CUNI.CZ]
    Sent: Saturday, October 18, 2003 10:47 AM
    To: NAVIGATION-L{at}LISTSERV.WEBKAHUNA.COM
    Subject: Re: Sight Reduction Formula
    
    
    
    >I will return to Ralph's question again.
    
    >First of all, his purported "standard" formula for the Azimuth in the form 
    "cos Z = (sin Dec [+ or abs. diff.] / (cos Hc * cos Lat)" seems erroneous. I 
    have never seen it, but above all, it produces wrong results. See the file 
    http://web.dkm.cz/kalivoda/Ralph.xls , where I tried the case with contrary 
    names for Dec and Lat, too. (You have my last trial after several previous 
    ones there.) Ralph's "standard" formula gives a wrong result. Maybe Ralph 
    made a mistake while transcribing it?
    
    
    

       
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