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    Re: spherical triangle
    From: Robert Eno
    Date: 2007 Jun 08, 09:49 -0400

    Wayne,

    If you look at Dutton's Navigation and Piloting (14th ed), they refer to it as the "parallactic angle".  Beyond that, I am not aware of it being used in practical art of navigation.

    I am certain, however, that one of our resident mathematical geniuses will be able to provide a  more detailed explanation.

    cheers,

    Robert

     

    ----- Original Message -----

    From: Rebecca Lowry <xachaniwa---.com>

    Date: Friday, June 8, 2007 7:24 am

    Subject: [NavList 2947] spherical triangle

    > Hi,
    >   
    >  I new here, and have an odd question.
    >   
    >  I was reading this article,
    >  http://articles.adsabs.harvard.edu/cgi-bin/nph-
    > iarticle_query?1978JRASC..72...69F&amp;data_type=PDF_HIGH&amp;whole_paper=YES&amp;type=PRINTER&amp;filetype=.pdf   and the author described the spherical triangle as this.
    >   
    >  a Triangle consisting of the 
    >  North pole, Zenith, and Postition of the Sun.
    >   
    >  The angle at the Zenith is the Azimuth. The angle at the North 
    > Pole is the Hour angle.
    >  The line connecting the Zenith and the Pole is the subtend angle 
    > Co-latitude.
    >  The line connecting the Zenith and the Sun is the subtend angle 
    > Co-altitude.
    >  The line connecting the Sun and the Pole is the subtend angle Co-
    > declination.   
    >  What does the angle at the Sun represent?
    >   
    >  thanks,
    >  Wayne
    >   

    >       
    > ---------------------------------
    > Need a vacation? Get great deals to amazing places on Yahoo! 
    > Travel. 

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