Merge commit 'd26ed8388f100a12996c0b92a98040ef2ba7fa8e' as 'ast'

1 files changed, 124 insertions, 0 deletions

diff --git a/ast/erfa/pom00.c b/ast/erfa/pom00.c
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+#include "erfa.h"
+
+void eraPom00(double xp, double yp, double sp, double rpom[3][3])
+/*
+**  - - - - - - - - - -
+**   e r a P o m 0 0
+**  - - - - - - - - - -
+**
+**  Form the matrix of polar motion for a given date, IAU 2000.
+**
+**  Given:
+**     xp,yp    double    coordinates of the pole (radians, Note 1)
+**     sp       double    the TIO locator s' (radians, Note 2)
+**
+**  Returned:
+**     rpom     double[3][3]   polar-motion matrix (Note 3)
+**
+**  Notes:
+**
+**  1) The arguments xp and yp are the coordinates (in radians) of the
+**     Celestial Intermediate Pole with respect to the International
+**     Terrestrial Reference System (see IERS Conventions 2003),
+**     measured along the meridians to 0 and 90 deg west respectively.
+**
+**  2) The argument sp is the TIO locator s', in radians, which
+**     positions the Terrestrial Intermediate Origin on the equator.  It
+**     is obtained from polar motion observations by numerical
+**     integration, and so is in essence unpredictable.  However, it is
+**     dominated by a secular drift of about 47 microarcseconds per
+**     century, and so can be taken into account by using s' = -47*t,
+**     where t is centuries since J2000.0.  The function eraSp00
+**     implements this approximation.
+**
+**  3) The matrix operates in the sense V(TRS) = rpom * V(CIP), meaning
+**     that it is the final rotation when computing the pointing
+**     direction to a celestial source.
+**
+**  Called:
+**     eraIr        initialize r-matrix to identity
+**     eraRz        rotate around Z-axis
+**     eraRy        rotate around Y-axis
+**     eraRx        rotate around X-axis
+**
+**  Reference:
+**
+**     McCarthy, D. D., Petit, G. (eds.), IERS Conventions (2003),
+**     IERS Technical Note No. 32, BKG (2004)
+**
+**  Copyright (C) 2013-2016, NumFOCUS Foundation.
+**  Derived, with permission, from the SOFA library.  See notes at end of file.
+*/
+{
+
+/* Construct the matrix. */
+   eraIr(rpom);
+   eraRz(sp, rpom);
+   eraRy(-xp, rpom);
+   eraRx(-yp, rpom);
+
+   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.
+**  
+*/