From d54fe7c1f704a63824c5bfa0ece65245572e9b27 Mon Sep 17 00:00:00 2001
From: Joseph Hunkeler <jhunkeler@gmail.com>
Date: Wed, 4 Mar 2015 21:21:30 -0500
Subject: Initial commit

---
 src/slalib/pvobs.f | 59 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 59 insertions(+)
 create mode 100644 src/slalib/pvobs.f

(limited to 'src/slalib/pvobs.f')

diff --git a/src/slalib/pvobs.f b/src/slalib/pvobs.f
new file mode 100644
index 0000000..116bc06
--- /dev/null
+++ b/src/slalib/pvobs.f
@@ -0,0 +1,59 @@
+      SUBROUTINE sla_PVOBS (P, H, STL, PV)
+*+
+*     - - - - - -
+*      P V O B S
+*     - - - - - -
+*
+*  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:  sla_GEOC
+*
+*  IAU 1976 constants are used.
+*
+*  P.T.Wallace   Starlink   14 November 1994
+*
+*  Copyright (C) 1995 Rutherford Appleton Laboratory
+*-
+
+      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 sla_GEOC(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
-- 
cgit