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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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-#include "erfa.h"
-
-void eraC2tcio(double rc2i[3][3], double era, double rpom[3][3],
- double rc2t[3][3])
-/*
-** - - - - - - - - - -
-** e r a C 2 t c i o
-** - - - - - - - - - -
-**
-** Assemble the celestial to terrestrial matrix from CIO-based
-** components (the celestial-to-intermediate matrix, the Earth Rotation
-** Angle and the polar motion matrix).
-**
-** Given:
-** rc2i double[3][3] celestial-to-intermediate matrix
-** era double Earth rotation angle (radians)
-** rpom double[3][3] polar-motion matrix
-**
-** Returned:
-** rc2t double[3][3] celestial-to-terrestrial matrix
-**
-** Notes:
-**
-** 1) This function constructs the rotation matrix that transforms
-** vectors in the celestial system into vectors in the terrestrial
-** system. It does so starting from precomputed components, namely
-** the matrix which rotates from celestial coordinates to the
-** intermediate frame, the Earth rotation angle and the polar motion
-** matrix. One use of the present function is when generating a
-** series of celestial-to-terrestrial matrices where only the Earth
-** Rotation Angle changes, avoiding the considerable overhead of
-** recomputing the precession-nutation more often than necessary to
-** achieve given accuracy objectives.
-**
-** 2) The relationship between the arguments is as follows:
-**
-** [TRS] = RPOM * R_3(ERA) * rc2i * [CRS]
-**
-** = rc2t * [CRS]
-**
-** where [CRS] is a vector in the Geocentric Celestial Reference
-** System and [TRS] is a vector in the International Terrestrial
-** Reference System (see IERS Conventions 2003).
-**
-** Called:
-** eraCr copy r-matrix
-** eraRz rotate around Z-axis
-** eraRxr product of two r-matrices
-**
-** Reference:
-**
-** McCarthy, D. D., Petit, G. (eds.), 2004, IERS Conventions (2003),
-** IERS Technical Note No. 32, BKG
-**
-** Copyright (C) 2013-2016, NumFOCUS Foundation.
-** Derived, with permission, from the SOFA library. See notes at end of file.
-*/
-{
- double r[3][3];
-
-
-/* Construct the matrix. */
- eraCr(rc2i, r);
- eraRz(era, r);
- eraRxr(rpom, r, rc2t);
-
- 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.
-**
-*/