update ast 8.6.3

1 files changed, 181 insertions, 0 deletions

diff --git a/ast/erfa/bp00.c b/ast/erfa/bp00.c
new file mode 100644
index 0000000..dd387ea
--- /dev/null
+++ b/ast/erfa/bp00.c
@@ -0,0 +1,181 @@
+#include "erfa.h"
+
+void eraBp00(double date1, double date2,
+             double rb[3][3], double rp[3][3], double rbp[3][3])
+/*
+**  - - - - - - - -
+**   e r a B p 0 0
+**  - - - - - - - -
+**
+**  Frame bias and precession, IAU 2000.
+**
+**  Given:
+**     date1,date2  double         TT as a 2-part Julian Date (Note 1)
+**
+**  Returned:
+**     rb           double[3][3]   frame bias matrix (Note 2)
+**     rp           double[3][3]   precession matrix (Note 3)
+**     rbp          double[3][3]   bias-precession matrix (Note 4)
+**
+**  Notes:
+**
+**  1) The TT date date1+date2 is a Julian Date, apportioned in any
+**     convenient way between the two arguments.  For example,
+**     JD(TT)=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.
+**
+**  2) The matrix rb transforms vectors from GCRS to mean J2000.0 by
+**     applying frame bias.
+**
+**  3) The matrix rp transforms vectors from J2000.0 mean equator and
+**     equinox to mean equator and equinox of date by applying
+**     precession.
+**
+**  4) The matrix rbp transforms vectors from GCRS to mean equator and
+**     equinox of date by applying frame bias then precession.  It is
+**     the product rp x rb.
+**
+**  5) It is permissible to re-use the same array in the returned
+**     arguments.  The arrays are filled in the order given.
+**
+**  Called:
+**     eraBi00      frame bias components, IAU 2000
+**     eraPr00      IAU 2000 precession adjustments
+**     eraIr        initialize r-matrix to identity
+**     eraRx        rotate around X-axis
+**     eraRy        rotate around Y-axis
+**     eraRz        rotate around Z-axis
+**     eraCr        copy r-matrix
+**     eraRxr       product of two r-matrices
+**
+**  Reference:
+**     "Expressions for the Celestial Intermediate Pole and Celestial
+**     Ephemeris Origin consistent with the IAU 2000A precession-
+**     nutation model", Astron.Astrophys. 400, 1145-1154 (2003)
+**
+**     n.b. The celestial ephemeris origin (CEO) was renamed "celestial
+**          intermediate origin" (CIO) by IAU 2006 Resolution 2.
+**
+**  Copyright (C) 2013-2016, NumFOCUS Foundation.
+**  Derived, with permission, from the SOFA library.  See notes at end of file.
+*/
+{
+/* J2000.0 obliquity (Lieske et al. 1977) */
+   const double EPS0 = 84381.448 * ERFA_DAS2R;
+
+   double t, dpsibi, depsbi, dra0, psia77, oma77, chia,
+          dpsipr, depspr, psia, oma, rbw[3][3];
+
+
+/* Interval between fundamental epoch J2000.0 and current date (JC). */
+   t = ((date1 - ERFA_DJ00) + date2) / ERFA_DJC;
+
+/* Frame bias. */
+   eraBi00(&dpsibi, &depsbi, &dra0);
+
+/* Precession angles (Lieske et al. 1977) */
+   psia77 = (5038.7784 + (-1.07259 + (-0.001147) * t) * t) * t * ERFA_DAS2R;
+   oma77  =       EPS0 + ((0.05127 + (-0.007726) * t) * t) * t * ERFA_DAS2R;
+   chia   = (  10.5526 + (-2.38064 + (-0.001125) * t) * t) * t * ERFA_DAS2R;
+
+/* Apply IAU 2000 precession corrections. */
+   eraPr00(date1, date2, &dpsipr, &depspr);
+   psia = psia77 + dpsipr;
+   oma  = oma77  + depspr;
+
+/* Frame bias matrix: GCRS to J2000.0. */
+   eraIr(rbw);
+   eraRz(dra0, rbw);
+   eraRy(dpsibi*sin(EPS0), rbw);
+   eraRx(-depsbi, rbw);
+   eraCr(rbw, rb);
+
+/* Precession matrix: J2000.0 to mean of date. */
+   eraIr(rp);
+   eraRx(EPS0, rp);
+   eraRz(-psia, rp);
+   eraRx(-oma, rp);
+   eraRz(chia, rp);
+
+/* Bias-precession matrix: GCRS to mean of date. */
+   eraRxr(rp, rbw, rbp);
+
+   return;
+
+}
+/*----------------------------------------------------------------------
+**  
+**  
+**  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.
+**  
+*/