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authorWilliam Joye <wjoye@cfa.harvard.edu>2019-05-10 18:52:35 (GMT)
committerWilliam Joye <wjoye@cfa.harvard.edu>2019-05-10 18:52:35 (GMT)
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-/*
-*+
-* Name:
-* palMapqkz
-
-* Purpose:
-* Quick mean to apparent place (no proper motion or parallax).
-
-* Language:
-* Starlink ANSI C
-
-* Type of Module:
-* Library routine
-
-* Invocation:
-* void palMapqkz( double rm, double dm, double amprms[21],
-* double *ra, double *da )
-
-* Arguments:
-* rm = double (Given)
-* Mean RA (radians).
-* dm = double (Given)
-* Mean Dec (radians).
-* amprms = double[21] (Given)
-* Star-independent mean-to-apparent parameters (see palMappa):
-* (0-3) not used
-* (4-6) heliocentric direction of the Earth (unit vector)
-* (7) not used
-* (8-10) abv: barycentric Earth velocity in units of c
-* (11) sqrt(1-v^2) where v=modulus(abv)
-* (12-20) precession/nutation (3,3) matrix
-* ra = double * (Returned)
-* Apparent RA (radians).
-* da = double * (Returned)
-* Apparent Dec (radians).
-
-* Description:
-* Quick mean to apparent place: transform a star RA,dec from
-* mean place to geocentric apparent place, given the
-* star-independent parameters, and assuming zero parallax
-* and proper motion.
-*
-* Use of this function is appropriate when efficiency is important
-* and where many star positions, all with parallax and proper
-* motion either zero or already allowed for, and all referred to
-* the same equator and equinox, are to be transformed for one
-* epoch. The star-independent parameters can be obtained by
-* calling the palMappa function.
-*
-* The corresponding function for the case of non-zero parallax
-* and proper motion is palMapqk.
-
-* Notes:
-* - The reference systems and timescales used are IAU 2006.
-* - The mean place rm, dm and the vectors amprms[1-3] and amprms[4-6]
-* are referred to the mean equinox and equator of the epoch
-* specified when generating the precession/nutation matrix
-* amprms[12-20]. In the call to palMappa (q.v.) normally used
-* to populate amprms, this epoch is the first argument (eq).
-* - The vector amprms(4-6) is referred to the mean equinox and
-* equator of epoch eq.
-* - Strictly speaking, the routine is not valid for solar-system
-* sources, though the error will usually be extremely small.
-* However, to prevent gross errors in the case where the
-* position of the Sun is specified, the gravitational
-* deflection term is restrained within about 920 arcsec of the
-* centre of the Sun's disc. The term has a maximum value of
-* about 1.85 arcsec at this radius, and decreases to zero as
-* the centre of the disc is approached.
-
-* Authors:
-* PTW: Pat Wallace (STFC)
-* {enter_new_authors_here}
-
-* History:
-* 2012-02-13 (PTW):
-* Initial version.
-* Adapted with permission from the Fortran SLALIB library.
-* {enter_further_changes_here}
-
-* Copyright:
-* Copyright (C) 1999 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 "pal1sofa.h"
-
-void palMapqkz ( double rm, double dm, double amprms[21], double *ra,
- double *da ){
-
-/* Local Variables: */
- int i;
- double ab1, abv[3], p[3], w, p1dv, p2[3], p3[3];
- double gr2e, pde, pdep1, ehn[3], p1[3];
-
-/* Unpack scalar and vector parameters. */
- ab1 = amprms[11];
- gr2e = amprms[7];
- for( i = 0; i < 3; i++ ) {
- abv[i] = amprms[i+8];
- ehn[i] = amprms[i+4];
- }
-
-/* Spherical to x,y,z. */
- eraS2c( rm, dm, p );
-
-/* Light deflection (restrained within the Sun's disc) */
- pde = eraPdp( p, ehn );
- pdep1 = pde + 1.0;
- w = gr2e / ( pdep1 > 1.0e-5 ? pdep1 : 1.0e-5 );
- for( i = 0; i < 3; i++) {
- p1[i] = p[i] + w * ( ehn[i] - pde * p[i] );
- }
-
-/* Aberration. */
- p1dv = eraPdp( p1, abv );
- w = 1.0 + p1dv / ( ab1 + 1.0 );
- for( i = 0; i < 3; i++ ) {
- p2[i] = ( ( ab1 * p1[i] ) + ( w * abv[i] ) );
- }
-
-/* Precession and nutation. */
- eraRxp( (double(*)[3]) &amprms[12], p2, p3 );
-
-/* Geocentric apparent RA,dec. */
- eraC2s( p3, ra, da );
- *ra = eraAnp( *ra );
-}