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+.help fk54z Jun99 "Slalib Package"
+.nf
+
+      SUBROUTINE slF54Z (R2000,D2000,BEPOCH,
+     :                      R1950,D1950,DR1950,DD1950)
+
+     - - - - - -
+      F 5 4 Z
+     - - - - - -
+
+  Convert a J2000.0 FK5 star position to B1950.0 FK4 assuming
+  zero proper motion and parallax (double precision)
+
+  This routine converts star positions from the new, IAU 1976,
+  FK5, Fricke system to the old, Bessel-Newcomb, FK4 system.
+
+  Given:
+     R2000,D2000     dp    J2000.0 FK5 RA,Dec (rad)
+     BEPOCH          dp    Besselian epoch (e.g. 1950D0)
+
+  Returned:
+     R1950,D1950     dp    B1950.0 FK4 RA,Dec (rad) at epoch BEPOCH
+     DR1950,DD1950   dp    B1950.0 FK4 proper motions (rad/trop.yr)
+
+  Notes:
+
+  1)  The proper motion in RA is dRA/dt rather than cos(Dec)*dRA/dt.
+
+  2)  Conversion from Julian epoch 2000.0 to Besselian epoch 1950.0
+      only is provided for.  Conversions involving other epochs will
+      require use of the appropriate precession routines before and
+      after this routine is called.
+
+  3)  Unlike in the slFK54 routine, the FK5 proper motions, the
+      parallax and the radial velocity are presumed zero.
+
+  4)  It is the intention that FK5 should be a close approximation
+      to an inertial frame, so that distant objects have zero proper
+      motion;  such objects have (in general) non-zero proper motion
+      in FK4, and this routine returns those fictitious proper
+      motions.
+
+  5)  The position returned by this routine is in the B1950
+      reference frame but at Besselian epoch BEPOCH.  For
+      comparison with catalogues the BEPOCH argument will
+      frequently be 1950D0.
+
+  Called:  slFK54, slPM
+
+  P.T.Wallace   Starlink   10 April 1990
+
+  Copyright (C) 1995 Rutherford Appleton Laboratory
+  Copyright (C) 1995 Association of Universities for Research in Astronomy Inc.
+
+.fi
+.endhelp