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diff --git a/math/slalib/dtf2r.f b/math/slalib/dtf2r.f
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+      SUBROUTINE slDTFR (IHOUR, IMIN, SEC, RAD, J)
+*+
+*     - - - - - -
+*      D T F R
+*     - - - - - -
+*
+*  Convert hours, minutes, seconds to radians (double precision)
+*
+*  Given:
+*     IHOUR       int       hours
+*     IMIN        int       minutes
+*     SEC         dp        seconds
+*
+*  Returned:
+*     RAD         dp        angle in radians
+*     J           int       status:  0 = OK
+*                                    1 = IHOUR outside range 0-23
+*                                    2 = IMIN outside range 0-59
+*                                    3 = SEC outside range 0-59.999...
+*
+*  Called:
+*     slDTFD
+*
+*  Notes:
+*
+*     1)  The result is computed even if any of the range checks fail.
+*
+*     2)  The sign must be dealt with outside this routine.
+*
+*  P.T.Wallace   Starlink   July 1984
+*
+*  Copyright (C) 1995 Rutherford Appleton Laboratory
+*
+*  License:
+*    This program is free software; you can redistribute it and/or modify
+*    it under the terms of the GNU General Public License as published by
+*    the Free Software Foundation; either version 2 of the License, or
+*    (at your option) any later version.
+*
+*    This program is distributed in the hope that it will be useful,
+*    but WITHOUT ANY WARRANTY; without even the implied warranty of
+*    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+*    GNU General Public License for more details.
+*
+*    You should have received a copy of the GNU General Public License
+*    along with this program (see SLA_CONDITIONS); if not, write to the
+*    Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+*    Boston, MA  02110-1301  USA
+*
+*  Copyright (C) 1995 Association of Universities for Research in Astronomy Inc.
+*-
+
+      IMPLICIT NONE
+
+      INTEGER IHOUR,IMIN
+      DOUBLE PRECISION SEC,RAD
+      INTEGER J
+
+      DOUBLE PRECISION TURNS
+
+*  Turns to radians
+      DOUBLE PRECISION T2R
+      PARAMETER (T2R=6.283185307179586476925287D0)
+
+
+
+*  Convert to turns then radians
+      CALL slDTFD(IHOUR,IMIN,SEC,TURNS,J)
+      RAD=T2R*TURNS
+
+      END