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Diffstat (limited to 'ast/erfa/ltecm.c')
| -rw-r--r-- | ast/erfa/ltecm.c | 157 |
1 files changed, 0 insertions, 157 deletions
diff --git a/ast/erfa/ltecm.c b/ast/erfa/ltecm.c deleted file mode 100644 index c0bf28b..0000000 --- a/ast/erfa/ltecm.c +++ /dev/null @@ -1,157 +0,0 @@ -#include "erfa.h" - -void eraLtecm(double epj, double rm[3][3]) -/* -** - - - - - - - - - -** e r a L t e c m -** - - - - - - - - - -** -** ICRS equatorial to ecliptic rotation matrix, long-term. -** -** Given: -** epj double Julian epoch (TT) -** -** Returned: -** rm double[3][3] ICRS to ecliptic rotation matrix -** -** Notes: -** -** 1) The matrix is in the sense -** -** E_ep = rm x P_ICRS, -** -** where P_ICRS is a vector with respect to ICRS right ascension -** and declination axes and E_ep is the same vector with respect to -** the (inertial) ecliptic and equinox of epoch epj. -** -** 2) P_ICRS is a free vector, merely a direction, typically of unit -** magnitude, and not bound to any particular spatial origin, such -** as the Earth, Sun or SSB. No assumptions are made about whether -** it represents starlight and embodies astrometric effects such as -** parallax or aberration. The transformation is approximately that -** between mean J2000.0 right ascension and declination and ecliptic -** longitude and latitude, with only frame bias (always less than -** 25 mas) to disturb this classical picture. -** -** 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. -** -** Called: -** eraLtpequ equator pole, long term -** eraLtpecl ecliptic pole, long term -** eraPxp vector product -** eraPn normalize vector -** -** 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; - - double p[3], z[3], w[3], s, x[3], y[3]; - - -/* Equator pole. */ - eraLtpequ(epj, p); - -/* Ecliptic pole (bottom row of equatorial to ecliptic matrix). */ - eraLtpecl(epj, z); - -/* Equinox (top row of matrix). */ - eraPxp(p, z, w); - eraPn(w, &s, x); - -/* Middle row of matrix. */ - eraPxp(z, x, y); - -/* Combine with frame bias. */ - rm[0][0] = x[0] - x[1]*dr + x[2]*dx; - rm[0][1] = x[0]*dr + x[1] + x[2]*de; - rm[0][2] = - x[0]*dx - x[1]*de + x[2]; - rm[1][0] = y[0] - y[1]*dr + y[2]*dx; - rm[1][1] = y[0]*dr + y[1] + y[2]*de; - rm[1][2] = - y[0]*dx - y[1]*de + y[2]; - rm[2][0] = z[0] - z[1]*dr + z[2]*dx; - rm[2][1] = z[0]*dr + z[1] + z[2]*de; - rm[2][2] = - z[0]*dx - z[1]*de + z[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. -** -*/ |