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    Re: Marq St. Hilaire - Altitude intercept method
    From: Andr�s Ruiz
    Date: 2007 Oct 25, 07:42 +0200

    Yes, thanks.
    I copy & paste it from my article " Vector equation of the circle of equal 
    altitude " without checking this.
    
    The equation is:
    
    sin H  = cos B cos Dec cos ( GHA-L ) + sin B sin Dec
    -90 <= Dec <= +90�
    0 <= GHA <= 360� (W to E)
    0 <= H <= 90�
    -90 <= B <= +90�
    0 <= L <= 360� (W to E)
    
    and
    
    LHA = GHA+L 
    sin H  = cos B cos Dec cos ( GHA+L ) + sin B sin Dec
    -180(W) <= L <= +180�(E)
    
    
    -----Mensaje original-----
    De: NavList@fer3.com [mailto:NavList@fer3.com] En nombre de dw
    Enviado el: jueves, 25 de octubre de 2007 1:10
    Para: NavList
    Asunto: [NavList 3551] Re: Marq St. Hilaire - Altitude intercept method
    
    
    Perhaps the equation you cite:
    
    sin H  = cos B cos Dec cos ( GHA-L ) + sin B sin Dec
    
    Should be GHA+L, using the conventions you give.
    
    
    
    
    
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