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      SUBROUTINE slDC6S (V, A, B, R, AD, BD, RD)

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      D C 6 S
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  Conversion of position & velocity in Cartesian coordinates
  to spherical coordinates (double precision)

  Given:
     V      d(6)   Cartesian position & velocity vector

  Returned:
     A      d      longitude (radians)
     B      d      latitude (radians)
     R      d      radial coordinate
     AD     d      longitude derivative (radians per unit time)
     BD     d      latitude derivative (radians per unit time)
     RD     d      radial derivative

  P.T.Wallace   Starlink   28 April 1996

  Copyright (C) 1996 Rutherford Appleton Laboratory
  Copyright (C) 1995 Association of Universities for Research in Astronomy Inc.

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