Merge commit '7fde2daeed593684120d75de07598154f3ddaf2c' as 'ast'

1 files changed, 154 insertions, 0 deletions

diff --git a/ast/erfa/atciq.c b/ast/erfa/atciq.c
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+#include "erfa.h"
+
+void eraAtciq(double rc, double dc,
+              double pr, double pd, double px, double rv,
+              eraASTROM *astrom, double *ri, double *di)
+/*
+**  - - - - - - - - -
+**   e r a A t c i q
+**  - - - - - - - - -
+**
+**  Quick ICRS, epoch J2000.0, to CIRS transformation, given precomputed
+**  star-independent astrometry parameters.
+**
+**  Use of this function is appropriate when efficiency is important and
+**  where many star positions are to be transformed for one date.  The
+**  star-independent parameters can be obtained by calling one of the
+**  functions eraApci[13], eraApcg[13], eraApco[13] or eraApcs[13].
+**
+**  If the parallax and proper motions are zero the eraAtciqz function
+**  can be used instead.
+**
+**  Given:
+**     rc,dc  double     ICRS RA,Dec at J2000.0 (radians)
+**     pr     double     RA proper motion (radians/year; Note 3)
+**     pd     double     Dec proper motion (radians/year)
+**     px     double     parallax (arcsec)
+**     rv     double     radial velocity (km/s, +ve if receding)
+**     astrom eraASTROM* star-independent astrometry parameters:
+**      pmt    double       PM time interval (SSB, Julian years)
+**      eb     double[3]    SSB to observer (vector, au)
+**      eh     double[3]    Sun to observer (unit vector)
+**      em     double       distance from Sun to observer (au)
+**      v      double[3]    barycentric observer velocity (vector, c)
+**      bm1    double       sqrt(1-|v|^2): reciprocal of Lorenz factor
+**      bpn    double[3][3] bias-precession-nutation matrix
+**      along  double       longitude + s' (radians)
+**      xpl    double       polar motion xp wrt local meridian (radians)
+**      ypl    double       polar motion yp wrt local meridian (radians)
+**      sphi   double       sine of geodetic latitude
+**      cphi   double       cosine of geodetic latitude
+**      diurab double       magnitude of diurnal aberration vector
+**      eral   double       "local" Earth rotation angle (radians)
+**      refa   double       refraction constant A (radians)
+**      refb   double       refraction constant B (radians)
+**
+**  Returned:
+**     ri,di   double    CIRS RA,Dec (radians)
+**
+**  Notes:
+**
+**  1) All the vectors are with respect to BCRS axes.
+**
+**  2) Star data for an epoch other than J2000.0 (for example from the
+**     Hipparcos catalog, which has an epoch of J1991.25) will require a
+**     preliminary call to eraPmsafe before use.
+**
+**  3) The proper motion in RA is dRA/dt rather than cos(Dec)*dRA/dt.
+**
+**  Called:
+**     eraPmpx      proper motion and parallax
+**     eraLdsun     light deflection by the Sun
+**     eraAb        stellar aberration
+**     eraRxp       product of r-matrix and pv-vector
+**     eraC2s       p-vector to spherical
+**     eraAnp       normalize angle into range 0 to 2pi
+**
+**  Copyright (C) 2013-2014, NumFOCUS Foundation.
+**  Derived, with permission, from the SOFA library.  See notes at end of file.
+*/
+{
+   double pco[3], pnat[3], ppr[3], pi[3], w;
+
+
+/* Proper motion and parallax, giving BCRS coordinate direction. */
+   eraPmpx(rc, dc, pr, pd, px, rv, astrom->pmt, astrom->eb, pco);
+
+/* Light deflection by the Sun, giving BCRS natural direction. */
+   eraLdsun(pco, astrom->eh, astrom->em, pnat);
+
+/* Aberration, giving GCRS proper direction. */
+   eraAb(pnat, astrom->v, astrom->em, astrom->bm1, ppr);
+
+/* Bias-precession-nutation, giving CIRS proper direction. */
+   eraRxp(astrom->bpn, ppr, pi);
+
+/* CIRS RA,Dec. */
+   eraC2s(pi, &w, di);
+   *ri = eraAnp(w);
+
+/* Finished. */
+
+}
+/*----------------------------------------------------------------------
+**  
+**  
+**  Copyright (C) 2013-2014, NumFOCUS Foundation.
+**  All rights reserved.
+**  
+**  This library is derived, with permission, from the International
+**  Astronomical Union's "Standards of Fundamental Astronomy" library,
+**  available from http://www.iausofa.org.
+**  
+**  The ERFA version is intended to retain identical functionality to
+**  the SOFA library, but made distinct through different function and
+**  file names, as set out in the SOFA license conditions.  The SOFA
+**  original has a role as a reference standard for the IAU and IERS,
+**  and consequently redistribution is permitted only in its unaltered
+**  state.  The ERFA version is not subject to this restriction and
+**  therefore can be included in distributions which do not support the
+**  concept of "read only" software.
+**  
+**  Although the intent is to replicate the SOFA API (other than
+**  replacement of prefix names) and results (with the exception of
+**  bugs;  any that are discovered will be fixed), SOFA is not
+**  responsible for any errors found in this version of the library.
+**  
+**  If you wish to acknowledge the SOFA heritage, please acknowledge
+**  that you are using a library derived from SOFA, rather than SOFA
+**  itself.
+**  
+**  
+**  TERMS AND CONDITIONS
+**  
+**  Redistribution and use in source and binary forms, with or without
+**  modification, are permitted provided that the following conditions
+**  are met:
+**  
+**  1 Redistributions of source code must retain the above copyright
+**    notice, this list of conditions and the following disclaimer.
+**  
+**  2 Redistributions in binary form must reproduce the above copyright
+**    notice, this list of conditions and the following disclaimer in
+**    the documentation and/or other materials provided with the
+**    distribution.
+**  
+**  3 Neither the name of the Standards Of Fundamental Astronomy Board,
+**    the International Astronomical Union nor the names of its
+**    contributors may be used to endorse or promote products derived
+**    from this software without specific prior written permission.
+**  
+**  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+**  "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+**  LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+**  FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE
+**  COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+**  INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+**  BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+**  LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+**  CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+**  LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+**  ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+**  POSSIBILITY OF SUCH DAMAGE.
+**  
+*/