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    Re: Unexpected USNO height correction precepts
    From: Mehmet Guzey
    Date: 2018 Dec 24, 08:54 -0800

    Hello Paul,

    Thank you very much for taking the time to check my values.

    I also checked my position angle function, which i got from sofa library. it is like this:

    **  Given:
    **     al     double     longitude of point A (e.g. RA) in radians
    **     ap     double     latitude of point A (e.g. Dec) in radians
    **     bl     double     longitude of point B
    **     bp     double     latitude of point B
    {
       double dl, x, y, pa;
    
    
       dl = bl - al;
       y = sin(dl) * cos(bp);
       x = sin(bp) * cos(ap) - cos(bp) * sin(ap) * cos(dl);
       pa = ((x != 0.0) || (y != 0.0)) ? atan2(y, x) : 0.0;
    
       return pa;

    I am happy that you agree on other values.

    There is always room to learn something new.

    Have a great week.

    Mehmet

       
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