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authorWilliam Joye <wjoye@cfa.harvard.edu>2019-05-10 16:22:37 (GMT)
committerWilliam Joye <wjoye@cfa.harvard.edu>2019-05-10 16:22:37 (GMT)
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upgrade ast 8.7.1
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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.
-**
-*/