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+.help rvlsrk Jun99 "Slalib Package"
+.nf
+
+      REAL FUNCTION slRVLK (R2000, D2000)
+
+     - - - - - - -
+      R V L K
+     - - - - - - -
+
+  Velocity component in a given direction due to the Sun's motion
+  with respect to an adopted kinematic Local Standard of Rest.
+
+  (single precision)
+
+  Given:
+     R2000,D2000   r    J2000.0 mean RA,Dec (radians)
+
+  Result:
+     Component of "standard" solar motion in direction R2000,D2000 (km/s)
+
+  Sign convention:
+     The result is +ve when the Sun is receding from the given point on
+     the sky.
+
+  Note:  The Local Standard of Rest used here is one of several
+         "kinematical" LSRs in common use.  A kinematical LSR is the
+         mean standard of rest of specified star catalogues or stellar
+         populations.  The Sun's motion with respect to a kinematical
+         LSR is known as the "standard" solar motion.
+
+         There is another sort of LSR, the "dynamical" LSR, which is a
+         point in the vicinity of the Sun which is in a circular orbit
+         around the Galactic centre.  The Sun's motion with respect to
+         the dynamical LSR is called the "peculiar" solar motion.  To
+         obtain a radial velocity correction with respect to the
+         dynamical LSR use the routine slRVLD.
+
+  Reference:  Delhaye (1965), in "Stars and Stellar Systems", vol 5,
+              p73.
+
+  Called:
+     slCS2C, slVDV
+
+  P.T.Wallace   Starlink   11 March 1994
+
+  Copyright (C) 1995 Rutherford Appleton Laboratory
+  Copyright (C) 1995 Association of Universities for Research in Astronomy Inc.
+
+.fi
+.endhelp