UVAA:

Path: SC/Ephem

% Apparent sun vector from quantities tabulated in the astronomical almanac. 
   If the sign of hRA or dDec is - make the sign of the other elements negative 
   also.

   Since version 1.
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   Form:
   [u] = UVAA( hRA,mRA,sRA,dDec,mDec,sDec )
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   ------
   Inputs
   ------
   hRA       (1,1)  Right ascension in (hours)
   mRA       (1,1)  Right ascension in (minutes)
   sRA       (1,1)  Right ascension in (seconds)
   dDec      (1,1)  Declination in (deg)
   mDec      (1,1)  Declination in (minutes)
   sDec      (1,1)  Declination in (seconds)

   -------
   Outputs
   -------
   u         (3,1)   Unit sun vector

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