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Diffstat (limited to 'ast/erfa/lteceq.c')
| -rw-r--r-- | ast/erfa/lteceq.c | 138 |
1 files changed, 0 insertions, 138 deletions
diff --git a/ast/erfa/lteceq.c b/ast/erfa/lteceq.c deleted file mode 100644 index 9ba725d..0000000 --- a/ast/erfa/lteceq.c +++ /dev/null @@ -1,138 +0,0 @@ -#include "erfa.h" - -void eraLteceq(double epj, double dl, double db, double *dr, double *dd) -/* -** - - - - - - - - - - -** e r a L t e c e q -** - - - - - - - - - - -** -** Transformation from ecliptic coordinates (mean equinox and ecliptic -** of date) to ICRS RA,Dec, using a long-term precession model. -** -** Given: -** epj double Julian epoch (TT) -** dl,db double ecliptic longitude and latitude (radians) -** -** Returned: -** dr,dd double ICRS right ascension and declination (radians) -** -** 1) No assumptions are made about whether the coordinates represent -** starlight and embody astrometric effects such as parallax or -** aberration. -** -** 2) The transformation is approximately that from ecliptic longitude -** and latitude (mean equinox and ecliptic of date) to mean J2000.0 -** right ascension and declination, 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: -** eraS2c spherical coordinates to unit vector -** eraLtecm J2000.0 to ecliptic rotation matrix, long term -** eraTrxp product of transpose of r-matrix and p-vector -** eraC2s unit vector to spherical coordinates -** eraAnp normalize angle into range 0 to 2pi -** eraAnpm normalize angle into range +/- pi -** -** 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. -*/ -{ - double rm[3][3], v1[3], v2[3], a, b; - - -/* Spherical to Cartesian. */ - eraS2c(dl, db, v1); - -/* Rotation matrix, ICRS equatorial to ecliptic. */ - eraLtecm(epj, rm); - -/* The transformation from ecliptic to ICRS. */ - eraTrxp(rm, v1, v2); - -/* Cartesian to spherical. */ - eraC2s(v2, &a, &b); - -/* Express in conventional ranges. */ - *dr = eraAnp(a); - *dd = eraAnpm(b); - -} -/*---------------------------------------------------------------------- -** -** -** 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. -** -*/ |