U2RADec:

Path: AerospaceUtils/Coord

% Computes the right ascension and declination from a unit vector.
 -pi/2 <= dec < pi/2. If rALimit is entered and positive, 0 <= rA < 2*pi

 Since version 1.
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   Form:
   [rA, dec] = U2RADec( u, rALimit )
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   ------
   Inputs
   ------
   u            (3,n)     Unit vectors
   rALimit       (1)      If > 0, will force 0 <= rA < 2*pi,
                           otherwise -pi <= rA <= pi (default)

   -------
   Outputs
   -------
   rA           (1,n)     Right ascension
   dec          (1,n)     Declination

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