upgrade ast 8.7.1

1 files changed, 174 insertions, 0 deletions

diff --git a/ast/erfa/pfw06.c b/ast/erfa/pfw06.c
new file mode 100644
index 0000000..b510f0a
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+++ b/ast/erfa/pfw06.c
@@ -0,0 +1,174 @@
+#include "erfa.h"
+
+void eraPfw06(double date1, double date2,
+              double *gamb, double *phib, double *psib, double *epsa)
+/*
+**  - - - - - - - - -
+**   e r a P f w 0 6
+**  - - - - - - - - -
+**
+**  Precession angles, IAU 2006 (Fukushima-Williams 4-angle formulation).
+**
+**  Given:
+**     date1,date2  double   TT as a 2-part Julian Date (Note 1)
+**
+**  Returned:
+**     gamb         double   F-W angle gamma_bar (radians)
+**     phib         double   F-W angle phi_bar (radians)
+**     psib         double   F-W angle psi_bar (radians)
+**     epsa         double   F-W angle epsilon_A (radians)
+**
+**  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) Naming the following points:
+**
+**           e = J2000.0 ecliptic pole,
+**           p = GCRS pole,
+**           E = mean ecliptic pole of date,
+**     and   P = mean pole of date,
+**
+**     the four Fukushima-Williams angles are as follows:
+**
+**        gamb = gamma_bar = epE
+**        phib = phi_bar = pE
+**        psib = psi_bar = pEP
+**        epsa = epsilon_A = EP
+**
+**  3) The matrix representing the combined effects of frame bias and
+**     precession is:
+**
+**        PxB = R_1(-epsa).R_3(-psib).R_1(phib).R_3(gamb)
+**
+**  4) The matrix representing the combined effects of frame bias,
+**     precession and nutation is simply:
+**
+**        NxPxB = R_1(-epsa-dE).R_3(-psib-dP).R_1(phib).R_3(gamb)
+**
+**     where dP and dE are the nutation components with respect to the
+**     ecliptic of date.
+**
+**  Reference:
+**
+**     Hilton, J. et al., 2006, Celest.Mech.Dyn.Astron. 94, 351
+**
+**  Called:
+**     eraObl06     mean obliquity, IAU 2006
+**
+**  Copyright (C) 2013-2016, NumFOCUS Foundation.
+**  Derived, with permission, from the SOFA library.  See notes at end of file.
+*/
+{
+   double t;
+
+
+/* Interval between fundamental date J2000.0 and given date (JC). */
+   t = ((date1 - ERFA_DJ00) + date2) / ERFA_DJC;
+
+/* P03 bias+precession angles. */
+   *gamb = (    -0.052928     +
+           (    10.556378     +
+           (     0.4932044    +
+           (    -0.00031238   +
+           (    -0.000002788  +
+           (     0.0000000260 )
+           * t) * t) * t) * t) * t) * ERFA_DAS2R;
+   *phib = ( 84381.412819     +
+           (   -46.811016     +
+           (     0.0511268    +
+           (     0.00053289   +
+           (    -0.000000440  +
+           (    -0.0000000176 )
+           * t) * t) * t) * t) * t) * ERFA_DAS2R;
+   *psib = (    -0.041775     +
+           (  5038.481484     +
+           (     1.5584175    +
+           (    -0.00018522   +
+           (    -0.000026452  +
+           (    -0.0000000148 )
+           * t) * t) * t) * t) * t) * ERFA_DAS2R;
+   *epsa =  eraObl06(date1, date2);
+
+   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.
+**  
+*/