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diff --git a/src/slalib/cr2af.f b/src/slalib/cr2af.f
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+      SUBROUTINE sla_CR2AF (NDP, ANGLE, SIGN, IDMSF)
+*+
+*     - - - - - -
+*      C R 2 A F
+*     - - - - - -
+*
+*  Convert an angle in radians into degrees, arcminutes, arcseconds
+*  (single precision)
+*
+*  Given:
+*     NDP       int      number of decimal places of arcseconds
+*     ANGLE     real     angle in radians
+*
+*  Returned:
+*     SIGN      char     '+' or '-'
+*     IDMSF     int(4)   degrees, arcminutes, arcseconds, fraction
+*
+*  Notes:
+*
+*     1)  NDP less than zero is interpreted as zero.
+*
+*     2)  The largest useful value for NDP is determined by the size of
+*         ANGLE, the format of REAL floating-point numbers on the target
+*         machine, and the risk of overflowing IDMSF(4).  For example,
+*         on the VAX, for ANGLE up to 2pi, the available floating-point
+*         precision corresponds roughly to NDP=3.  This is well below
+*         the ultimate limit of NDP=9 set by the capacity of the 32-bit
+*         integer IHMSF(4).
+*
+*     3)  The absolute value of ANGLE may exceed 2pi.  In cases where it
+*         does not, it is up to the caller to test for and handle the
+*         case where ANGLE is very nearly 2pi and rounds up to 360 deg,
+*         by testing for IDMSF(1)=360 and setting IDMSF(1-4) to zero.
+*
+*  Called:  sla_CD2TF
+*
+*  P.T.Wallace   Starlink   18 March 1999
+*
+*  Copyright (C) 1999 Rutherford Appleton Laboratory
+*-
+
+      IMPLICIT NONE
+
+      INTEGER NDP
+      REAL ANGLE
+      CHARACTER SIGN*(*)
+      INTEGER IDMSF(4)
+
+*  Hours to degrees * radians to turns
+      REAL F
+      PARAMETER (F=15.0/6.283185307179586476925287)
+
+
+
+*  Scale then use days to h,m,s routine
+      CALL sla_CD2TF(NDP,ANGLE*F,SIGN,IDMSF)
+
+      END