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Diffstat (limited to 'ast/erfa/c2ixys.c')
| -rw-r--r-- | ast/erfa/c2ixys.c | 132 |
1 files changed, 0 insertions, 132 deletions
diff --git a/ast/erfa/c2ixys.c b/ast/erfa/c2ixys.c deleted file mode 100644 index 1c92687..0000000 --- a/ast/erfa/c2ixys.c +++ /dev/null @@ -1,132 +0,0 @@ -#include "erfa.h" - -void eraC2ixys(double x, double y, double s, double rc2i[3][3]) -/* -** - - - - - - - - - - -** e r a C 2 i x y s -** - - - - - - - - - - -** -** Form the celestial to intermediate-frame-of-date matrix given the CIP -** X,Y and the CIO locator s. -** -** Given: -** x,y double Celestial Intermediate Pole (Note 1) -** s double the CIO locator s (Note 2) -** -** Returned: -** rc2i double[3][3] celestial-to-intermediate matrix (Note 3) -** -** Notes: -** -** 1) The Celestial Intermediate Pole coordinates are the x,y -** components of the unit vector in the Geocentric Celestial -** Reference System. -** -** 2) The CIO locator s (in radians) positions the Celestial -** Intermediate Origin on the equator of the CIP. -** -** 3) The matrix rc2i is the first stage in the transformation from -** celestial to terrestrial coordinates: -** -** [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), ERA is the Earth -** Rotation Angle and RPOM is the polar motion matrix. -** -** Called: -** eraIr initialize r-matrix to identity -** eraRz rotate around Z-axis -** eraRy rotate around Y-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. -*/ -{ - double r2, e, d; - - -/* Obtain the spherical angles E and d. */ - r2 = x*x + y*y; - e = (r2 > 0.0) ? atan2(y, x) : 0.0; - d = atan(sqrt(r2 / (1.0 - r2))); - -/* Form the matrix. */ - eraIr(rc2i); - eraRz(e, rc2i); - eraRy(d, rc2i); - eraRz(-(e+s), rc2i); - - 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. -** -*/ |