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      SUBROUTINE slCC2S (V, A, B)

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      C C 2 S
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  Direction cosines to spherical coordinates (single precision)

  Given:
     V     r(3)   x,y,z vector

  Returned:
     A,B   r      spherical coordinates in radians

  The spherical coordinates are longitude (+ve anticlockwise
  looking from the +ve latitude pole) and latitude.  The
  Cartesian coordinates are right handed, with the x axis
  at zero longitude and latitude, and the z axis at the
  +ve latitude pole.

  If V is null, zero A and B are returned.
  At either pole, zero A is returned.

  P.T.Wallace   Starlink   July 1989

  Copyright (C) 1995 Rutherford Appleton Laboratory
  Copyright (C) 1995 Association of Universities for Research in Astronomy Inc.

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