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Diffstat (limited to 'ast/erfa/ltpb.c')
| -rw-r--r-- | ast/erfa/ltpb.c | 133 |
1 files changed, 0 insertions, 133 deletions
diff --git a/ast/erfa/ltpb.c b/ast/erfa/ltpb.c deleted file mode 100644 index 6818f19..0000000 --- a/ast/erfa/ltpb.c +++ /dev/null @@ -1,133 +0,0 @@ -#include "erfa.h" - -void eraLtpb(double epj, double rpb[3][3]) -/* -** - - - - - - - - -** e r a L t p b -** - - - - - - - - -** -** Long-term precession matrix, including ICRS frame bias. -** -** Given: -** epj double Julian epoch (TT) -** -** Returned: -** rpb double[3][3] precession-bias matrix, J2000.0 to date -** -** Notes: -** -** 1) The matrix is in the sense -** -** P_date = rpb x P_ICRS, -** -** where P_ICRS is a vector in the Geocentric Celestial Reference -** System, and P_date is the vector with respect to the Celestial -** Intermediate Reference System at that date but with nutation -** neglected. -** -** 2) A first order frame bias formulation is used, of sub- -** microarcsecond accuracy compared with a full 3D rotation. -** -** 3) The Vondrak et al. (2011, 2012) 400 millennia precession model -** agrees with the IAU 2006 precession at J2000.0 and stays within -** 100 microarcseconds during the 20th and 21st centuries. It is -** accurate to a few arcseconds throughout the historical period, -** worsening to a few tenths of a degree at the end of the -** +/- 200,000 year time span. -** -** References: -** -** Vondrak, J., Capitaine, N. and Wallace, P., 2011, New precession -** expressions, valid for long time intervals, Astron.Astrophys. 534, -** A22 -** -** Vondrak, J., Capitaine, N. and Wallace, P., 2012, New precession -** expressions, valid for long time intervals (Corrigendum), -** Astron.Astrophys. 541, C1 -** -** Copyright (C) 2013-2016, NumFOCUS Foundation. -** Derived, with permission, from the SOFA library. See notes at end of file. -*/ -{ -/* Frame bias (IERS Conventions 2010, Eqs. 5.21 and 5.33) */ - const double dx = -0.016617 * ERFA_DAS2R, - de = -0.0068192 * ERFA_DAS2R, - dr = -0.0146 * ERFA_DAS2R; - - int i; - double rp[3][3]; - - -/* Precession matrix. */ - eraLtp(epj, rp); - -/* Apply the bias. */ - for ( i = 0; i < 3; i++ ) { - rpb[i][0] = rp[i][0] - rp[i][1]*dr + rp[i][2]*dx; - rpb[i][1] = rp[i][0]*dr + rp[i][1] + rp[i][2]*de; - rpb[i][2] = -rp[i][0]*dx - rp[i][1]*de + rp[i][2]; - } - -} -/*---------------------------------------------------------------------- -** -** -** 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. -** -*/ |