1 files changed, 98 insertions, 0 deletions
diff --git a/ast/pal/palPrebn.c b/ast/pal/palPrebn.c
new file mode 100644
index 0000000..989ce59
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+++ b/ast/pal/palPrebn.c
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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);
+
+}