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diff --git a/math/slalib/pvobs.f b/math/slalib/pvobs.f
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+      SUBROUTINE slPVOB (P, H, STL, PV)
+*+
+*     - - - - - -
+*      P V O B
+*     - - - - - -
+*
+*  Position and velocity of an observing station (double precision)
+*
+*  Given:
+*     P     dp     latitude (geodetic, radians)
+*     H     dp     height above reference spheroid (geodetic, metres)
+*     STL   dp     local apparent sidereal time (radians)
+*
+*  Returned:
+*     PV    dp(6)  position/velocity 6-vector (AU, AU/s, true equator
+*                                              and equinox of date)
+*
+*  Called:  slGEOC
+*
+*  IAU 1976 constants are used.
+*
+*  P.T.Wallace   Starlink   14 November 1994
+*
+*  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
+
+      DOUBLE PRECISION P,H,STL,PV(6)
+
+      DOUBLE PRECISION R,Z,S,C,V
+
+*  Mean sidereal rate (at J2000) in radians per (UT1) second
+      DOUBLE PRECISION SR
+      PARAMETER (SR=7.292115855306589D-5)
+
+
+
+*  Geodetic to geocentric conversion
+      CALL slGEOC(P,H,R,Z)
+
+*  Functions of ST
+      S=SIN(STL)
+      C=COS(STL)
+
+*  Speed
+      V=SR*R
+
+*  Position
+      PV(1)=R*C
+      PV(2)=R*S
+      PV(3)=Z
+
+*  Velocity
+      PV(4)=-V*S
+      PV(5)=V*C
+      PV(6)=0D0
+
+      END