update ast 8.6.3

1 files changed, 233 insertions, 0 deletions

diff --git a/ast/erfa/apcs.c b/ast/erfa/apcs.c
new file mode 100644
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+++ b/ast/erfa/apcs.c
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+#include "erfa.h"
+
+void eraApcs(double date1, double date2, double pv[2][3],
+             double ebpv[2][3], double ehp[3],
+             eraASTROM *astrom)
+/*
+**  - - - - - - - -
+**   e r a A p c s
+**  - - - - - - - -
+**
+**  For an observer whose geocentric position and velocity are known,
+**  prepare star-independent astrometry parameters for transformations
+**  between ICRS and GCRS.  The Earth ephemeris is supplied by the
+**  caller.
+**
+**  The parameters produced by this function are required in the space
+**  motion, parallax, light deflection and aberration parts of the
+**  astrometric transformation chain.
+**
+**  Given:
+**     date1  double       TDB as a 2-part...
+**     date2  double       ...Julian Date (Note 1)
+**     pv     double[2][3] observer's geocentric pos/vel (m, m/s)
+**     ebpv   double[2][3] Earth barycentric PV (au, au/day)
+**     ehp    double[3]    Earth heliocentric P (au)
+**
+**  Returned:
+**     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       unchanged
+**      xpl    double       unchanged
+**      ypl    double       unchanged
+**      sphi   double       unchanged
+**      cphi   double       unchanged
+**      diurab double       unchanged
+**      eral   double       unchanged
+**      refa   double       unchanged
+**      refb   double       unchanged
+**
+**  Notes:
+**
+**  1) The TDB date date1+date2 is a Julian Date, apportioned in any
+**     convenient way between the two arguments.  For example,
+**     JD(TDB)=2450123.7 could be expressed in any of these ways, among
+**     others:
+**
+**            date1          date2
+**
+**         2450123.7           0.0       (JD method)
+**         2451545.0       -1421.3       (J2000 method)
+**         2400000.5       50123.2       (MJD method)
+**         2450123.5           0.2       (date & time method)
+**
+**     The JD method is the most natural and convenient to use in cases
+**     where the loss of several decimal digits of resolution is
+**     acceptable.  The J2000 method is best matched to the way the
+**     argument is handled internally and will deliver the optimum
+**     resolution.  The MJD method and the date & time methods are both
+**     good compromises between resolution and convenience.  For most
+**     applications of this function the choice will not be at all
+**     critical.
+**
+**     TT can be used instead of TDB without any significant impact on
+**     accuracy.
+**
+**  2) All the vectors are with respect to BCRS axes.
+**
+**  3) Providing separate arguments for (i) the observer's geocentric
+**     position and velocity and (ii) the Earth ephemeris is done for
+**     convenience in the geocentric, terrestrial and Earth orbit cases.
+**     For deep space applications it maybe more convenient to specify
+**     zero geocentric position and velocity and to supply the
+**     observer's position and velocity information directly instead of
+**     with respect to the Earth.  However, note the different units:
+**     m and m/s for the geocentric vectors, au and au/day for the
+**     heliocentric and barycentric vectors.
+**
+**  4) In cases where the caller does not wish to provide the Earth
+**     ephemeris, the function eraApcs13 can be used instead of the
+**     present function.  This computes the Earth ephemeris using the
+**     ERFA function eraEpv00.
+**
+**  5) This is one of several functions that inserts into the astrom
+**     structure star-independent parameters needed for the chain of
+**     astrometric transformations ICRS <-> GCRS <-> CIRS <-> observed.
+**
+**     The various functions support different classes of observer and
+**     portions of the transformation chain:
+**
+**          functions         observer        transformation
+**
+**       eraApcg eraApcg13    geocentric      ICRS <-> GCRS
+**       eraApci eraApci13    terrestrial     ICRS <-> CIRS
+**       eraApco eraApco13    terrestrial     ICRS <-> observed
+**       eraApcs eraApcs13    space           ICRS <-> GCRS
+**       eraAper eraAper13    terrestrial     update Earth rotation
+**       eraApio eraApio13    terrestrial     CIRS <-> observed
+**
+**     Those with names ending in "13" use contemporary ERFA models to
+**     compute the various ephemerides.  The others accept ephemerides
+**     supplied by the caller.
+**
+**     The transformation from ICRS to GCRS covers space motion,
+**     parallax, light deflection, and aberration.  From GCRS to CIRS
+**     comprises frame bias and precession-nutation.  From CIRS to
+**     observed takes account of Earth rotation, polar motion, diurnal
+**     aberration and parallax (unless subsumed into the ICRS <-> GCRS
+**     transformation), and atmospheric refraction.
+**
+**  6) The context structure astrom produced by this function is used by
+**     eraAtciq* and eraAticq*.
+**
+**  Called:
+**     eraCp        copy p-vector
+**     eraPm        modulus of p-vector
+**     eraPn        decompose p-vector into modulus and direction
+**     eraIr        initialize r-matrix to identity
+**
+**  Copyright (C) 2013-2016, NumFOCUS Foundation.
+**  Derived, with permission, from the SOFA library.  See notes at end of file.
+*/
+{
+/* au/d to m/s */
+   const double AUDMS = ERFA_DAU/ERFA_DAYSEC;
+
+/* Light time for 1 AU (day) */
+   const double CR = ERFA_AULT/ERFA_DAYSEC;
+
+   int i;
+   double dp, dv, pb[3], vb[3], ph[3], v2, w;
+
+
+/* Time since reference epoch, years (for proper motion calculation). */
+   astrom->pmt = ( (date1 - ERFA_DJ00) + date2 ) / ERFA_DJY;
+
+/* Adjust Earth ephemeris to observer. */
+   for (i = 0; i < 3; i++) {
+      dp = pv[0][i] / ERFA_DAU;
+      dv = pv[1][i] / AUDMS;
+      pb[i] = ebpv[0][i] + dp;
+      vb[i] = ebpv[1][i] + dv;
+      ph[i] = ehp[i] + dp;
+   }
+
+/* Barycentric position of observer (au). */
+   eraCp(pb, astrom->eb);
+
+/* Heliocentric direction and distance (unit vector and au). */
+   eraPn(ph, &astrom->em, astrom->eh);
+
+/* Barycentric vel. in units of c, and reciprocal of Lorenz factor. */
+   v2 = 0.0;
+   for (i = 0; i < 3; i++) {
+      w = vb[i] * CR;
+      astrom->v[i] = w;
+      v2 += w*w;
+   }
+   astrom->bm1 = sqrt(1.0 - v2);
+
+/* Reset the NPB matrix. */
+   eraIr(astrom->bpn);
+
+/* Finished. */
+
+}
+/*----------------------------------------------------------------------
+**  
+**  
+**  Copyright (C) 2013-2016, 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.
+**  
+*/