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Diffstat (limited to 'ast/erfa/eors.c')
| -rw-r--r-- | ast/erfa/eors.c | 117 |
1 files changed, 0 insertions, 117 deletions
diff --git a/ast/erfa/eors.c b/ast/erfa/eors.c deleted file mode 100644 index c1b5557..0000000 --- a/ast/erfa/eors.c +++ /dev/null @@ -1,117 +0,0 @@ -#include "erfa.h" - -double eraEors(double rnpb[3][3], double s) -/* -** - - - - - - - - -** e r a E o r s -** - - - - - - - - -** -** Equation of the origins, given the classical NPB matrix and the -** quantity s. -** -** Given: -** rnpb double[3][3] classical nutation x precession x bias matrix -** s double the quantity s (the CIO locator) -** -** Returned (function value): -** double the equation of the origins in radians. -** -** Notes: -** -** 1) The equation of the origins is the distance between the true -** equinox and the celestial intermediate origin and, equivalently, -** the difference between Earth rotation angle and Greenwich -** apparent sidereal time (ERA-GST). It comprises the precession -** (since J2000.0) in right ascension plus the equation of the -** equinoxes (including the small correction terms). -** -** 2) The algorithm is from Wallace & Capitaine (2006). -** -** References: -** -** Capitaine, N. & Wallace, P.T., 2006, Astron.Astrophys. 450, 855 -** -** Wallace, P. & Capitaine, N., 2006, Astron.Astrophys. 459, 981 -** -** Copyright (C) 2013-2016, NumFOCUS Foundation. -** Derived, with permission, from the SOFA library. See notes at end of file. -*/ -{ - double x, ax, xs, ys, zs, p, q, eo; - - -/* Evaluate Wallace & Capitaine (2006) expression (16). */ - x = rnpb[2][0]; - ax = x / (1.0 + rnpb[2][2]); - xs = 1.0 - ax * x; - ys = -ax * rnpb[2][1]; - zs = -x; - p = rnpb[0][0] * xs + rnpb[0][1] * ys + rnpb[0][2] * zs; - q = rnpb[1][0] * xs + rnpb[1][1] * ys + rnpb[1][2] * zs; - eo = ((p != 0) || (q != 0)) ? s - atan2(q, p) : s; - - return eo; - -} -/*---------------------------------------------------------------------- -** -** -** 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. -** -*/ |