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/*
*+
* Name:
* palAoppat
* Purpose:
* Recompute sidereal time to support apparent to observed place
* Language:
* Starlink ANSI C
* Type of Module:
* Library routine
* Invocation:
* void palAoppat( double date, double aoprms[14] );
* Arguments:
* date = double (Given)
* UTC date/time (modified Julian Date, JD-2400000.5)
* (see palAoppa description for comments on leap seconds)
* aoprms = double[14] (Given & Returned)
* Star-independent apparent-to-observed parameters. Updated
* by this routine. Requires element 12 to be the longitude +
* eqn of equinoxes + sidereal DUT and fills in element 13
* with the local apparent sidereal time (in radians).
* Description:
* This routine recomputes the sidereal time in the apparent to
* observed place star-independent parameter block.
* Authors:
* TIMJ: Tim Jenness (JAC, Hawaii)
* PTW: Patrick T. Wallace
* {enter_new_authors_here}
* Notes:
* - See palAoppa for more information.
* - The star-independent parameters are not treated as an opaque
* struct in order to retain compatibility with SLA.
* History:
* 2012-08-24 (TIMJ):
* Initial version, ported from Fortran SLA source.
* Adapted with permission from the Fortran SLALIB library.
* {enter_further_changes_here}
* Copyright:
* Copyright (C) 1995 Rutherford Appleton Laboratory
* Copyright (C) 2012 Science and Technology Facilities Council.
* All Rights Reserved.
* Licence:
* 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 3 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; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
* MA 02110-1301, USA.
* Bugs:
* {note_any_bugs_here}
*-
*/
#include "pal.h"
static double pal__Gmst( double ut1 );
void palAoppat( double date, double aoprms[14] ) {
aoprms[13] = pal__Gmst(date) + aoprms[12];
}
/* Use a private implementation of palGmst for testing that matches
the SLA rather than SOFA implementation. This is used for comparing
SLA with PAL refraction code. */
#include "math.h"
#include "palmac.h"
static double pal__Gmst( double ut1 ) {
double tu;
double gmst;
/* Julian centuries from fundamental epoch J2000 to this UT */
tu=(ut1-51544.5)/36525;
/* GMST at this UT */
gmst=palDranrm(fmod(ut1,1.0)*PAL__D2PI+
(24110.54841+
(8640184.812866+
(0.093104-6.2e-6*tu)*tu)*tu)*PAL__DS2R);
return gmst;
}
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