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77 lines
1.9 KiB
Fortran
77 lines
1.9 KiB
Fortran
SUBROUTINE sla_PVOBS (P, H, STL, PV)
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*+
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* - - - - - -
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* P V O B S
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* - - - - - -
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*
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* Position and velocity of an observing station (double precision)
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*
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* Given:
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* P dp latitude (geodetic, radians)
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* H dp height above reference spheroid (geodetic, metres)
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* STL dp local apparent sidereal time (radians)
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*
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* Returned:
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* PV dp(6) position/velocity 6-vector (AU, AU/s, true equator
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* and equinox of date)
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*
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* Called: sla_GEOC
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*
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* IAU 1976 constants are used.
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*
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* P.T.Wallace Starlink 14 November 1994
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*
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* Copyright (C) 1995 Rutherford Appleton Laboratory
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*
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* License:
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program (see SLA_CONDITIONS); if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place, Suite 330,
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* Boston, MA 02111-1307 USA
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*
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*-
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IMPLICIT NONE
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DOUBLE PRECISION P,H,STL,PV(6)
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DOUBLE PRECISION R,Z,S,C,V
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* Mean sidereal rate (at J2000) in radians per (UT1) second
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DOUBLE PRECISION SR
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PARAMETER (SR=7.292115855306589D-5)
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* Geodetic to geocentric conversion
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CALL sla_GEOC(P,H,R,Z)
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* Functions of ST
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S=SIN(STL)
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C=COS(STL)
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* Speed
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V=SR*R
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* Position
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PV(1)=R*C
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PV(2)=R*S
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PV(3)=Z
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* Velocity
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PV(4)=-V*S
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PV(5)=V*C
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PV(6)=0D0
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END
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