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authorWilliam Joye <wjoye@cfa.harvard.edu>2016-11-02 19:11:06 (GMT)
committerWilliam Joye <wjoye@cfa.harvard.edu>2016-11-02 19:11:06 (GMT)
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update ast
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-/*
-*+
-* Name:
-* palPrebn
-
-* Purpose:
-* Generate the matrix of precession between two objects (old)
-
-* Language:
-* Starlink ANSI C
-
-* Type of Module:
-* Library routine
-
-* Invocation:
-* void palPrebn ( double bep0, double bep1, double rmatp[3][3] );
-
-* Arguments:
-* bep0 = double (Given)
-* Beginning Besselian epoch.
-* bep1 = double (Given)
-* Ending Besselian epoch
-* rmatp = double[3][3] (Returned)
-* precession matrix in the sense V(BEP1) = RMATP * V(BEP0)
-
-* Description:
-* Generate the matrix of precession between two epochs,
-* using the old, pre-IAU1976, Bessel-Newcomb model, using
-* Kinoshita's formulation
-
-* Authors:
-* PTW: Pat Wallace (STFC)
-* TIMJ: Tim Jenness (JAC, Hawaii)
-* {enter_new_authors_here}
-
-* See Also:
-* Kinoshita, H. (1975) 'Formulas for precession', SAO Special
-* Report No. 364, Smithsonian Institution Astrophysical
-* Observatory, Cambridge, Massachusetts.
-
-* History:
-* 2012-02-12(TIMJ):
-* Initial version with documentation taken from Fortran SLA
-* Adapted with permission from the Fortran SLALIB library.
-* {enter_further_changes_here}
-
-* Copyright:
-* Copyright (C) 1996 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 Lesser 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 Lesser General Public License for more details.
-*
-* You should have received a copy of the GNU Lesser General
-* License along with this program. If not, see
-* <http://www.gnu.org/licenses/>.
-
-* Bugs:
-* {note_any_bugs_here}
-*-
-*/
-
-#include "pal.h"
-#include "palmac.h"
-
-void palPrebn ( double bep0, double bep1, double rmatp[3][3] ) {
-
- double t,bigt, zeta, theta, z, tas2r, w;
-
- /* Interval between basic epoch B1850.0 and beginning epoch in TC */
- bigt = (bep0-1850)/100.;
-
- /* Interval over which precession required, in tropical centuries */
- t = (bep1-bep0)/100.;
-
- /* Euler angles */
- tas2r = t * PAL__DAS2R;
- w = 2303.5548 + ( 1.39720 + 0.000059 * bigt) * bigt;
-
- zeta = ( w + ( 0.30242 - 0.000269 * bigt + 0.017996 * t ) * t ) * tas2r;
- z = ( w + ( 1.09478 + 0.000387 * bigt + 0.018324 * t ) * t ) * tas2r;
- theta = ( 2005.1125 + ( -0.85294 - 0.000365 * bigt ) * bigt +
- (-0.42647 - 0.000365 * bigt - 0.041802 * t ) * t ) * tas2r;
-
- /* Rotation matrix */
- palDeuler("ZYZ", -zeta, theta, -z, rmatp);
-
-}