src/slalib/dranrm.f


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DOUBLE PRECISION FUNCTION sla_DRANRM (ANGLE)
*+
*     - - - - - - -
*      D R A N R M
*     - - - - - - -
*
*  Normalize angle into range 0-2 pi  (double precision)
*
*  Given:
*     ANGLE     dp      the angle in radians
*
*  The result is ANGLE expressed in the range 0-2 pi (double
*  precision).
*
*  P.T.Wallace   Starlink   23 November 1995
*
*  Copyright (C) 1995 Rutherford Appleton Laboratory
*-

      IMPLICIT NONE

      DOUBLE PRECISION ANGLE

      DOUBLE PRECISION D2PI
      PARAMETER (D2PI=6.283185307179586476925286766559D0)


      sla_DRANRM=MOD(ANGLE,D2PI)
      IF (sla_DRANRM.LT.0D0) sla_DRANRM=sla_DRANRM+D2PI

      END