update ast 8.6.3

1 files changed, 141 insertions, 0 deletions

diff --git a/ast/erfa/eceq06.c b/ast/erfa/eceq06.c
new file mode 100644
index 0000000..e1ba72d
--- /dev/null
+++ b/ast/erfa/eceq06.c
@@ -0,0 +1,141 @@
+#include "erfa.h"
+
+void eraEceq06(double date1, double date2, double dl, double db,
+               double *dr, double *dd)
+/*
+**  - - - - - - - - - -
+**   e r a E c e q 0 6
+**  - - - - - - - - - -
+**
+**  Transformation from ecliptic coordinates (mean equinox and ecliptic
+**  of date) to ICRS RA,Dec, using the IAU 2006 precession model.
+**
+**  Given:
+**     date1,date2 double TT as a 2-part Julian date (Note 1)
+**     dl,db       double ecliptic longitude and latitude (radians)
+**
+**  Returned:
+**     dr,dd       double ICRS right ascension and declination (radians)
+**
+**  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) No assumptions are made about whether the coordinates represent
+**     starlight and embody astrometric effects such as parallax or
+**     aberration.
+**
+**  3) The transformation is approximately that from ecliptic longitude
+**     and latitude (mean equinox and ecliptic of date) to mean J2000.0
+**     right ascension and declination, with only frame bias (always
+**     less than 25 mas) to disturb this classical picture.
+**
+**  Called:
+**     eraS2c       spherical coordinates to unit vector
+**     eraEcm06     J2000.0 to ecliptic rotation matrix, IAU 2006
+**     eraTrxp      product of transpose of r-matrix and p-vector
+**     eraC2s       unit vector to spherical coordinates
+**     eraAnp       normalize angle into range 0 to 2pi
+**     eraAnpm      normalize angle into range +/- pi
+**
+**  Copyright (C) 2013-2016, NumFOCUS Foundation.
+**  Derived, with permission, from the SOFA library.  See notes at end of file.
+*/
+{
+   double rm[3][3], v1[3], v2[3], a, b;
+
+
+/* Spherical to Cartesian. */
+   eraS2c(dl, db, v1);
+
+/* Rotation matrix, ICRS equatorial to ecliptic. */
+   eraEcm06(date1, date2, rm);
+
+/* The transformation from ecliptic to ICRS. */
+   eraTrxp(rm, v1, v2);
+
+/* Cartesian to spherical. */
+   eraC2s(v2, &a, &b);
+
+/* Express in conventional ranges. */
+   *dr = eraAnp(a);
+   *dd = eraAnpm(b);
+
+}
+/*----------------------------------------------------------------------
+**  
+**  
+**  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.
+**  
+*/