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author | William Joye <wjoye@cfa.harvard.edu> | 2018-01-09 19:26:44 (GMT) |
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committer | William Joye <wjoye@cfa.harvard.edu> | 2018-01-09 19:26:44 (GMT) |
commit | 1332d38f2805d986ea130e43218c0d2e870b4dc1 (patch) | |
tree | aa72853cb8d0d8fcd53a6f5eddf196a374226706 /ast/erfa/pmat76.c | |
parent | 5e545ec8058cc5238dc870468b34b5d4617f307f (diff) | |
download | blt-1332d38f2805d986ea130e43218c0d2e870b4dc1.zip blt-1332d38f2805d986ea130e43218c0d2e870b4dc1.tar.gz blt-1332d38f2805d986ea130e43218c0d2e870b4dc1.tar.bz2 |
update ast 8.6.2
Diffstat (limited to 'ast/erfa/pmat76.c')
-rw-r--r-- | ast/erfa/pmat76.c | 150 |
1 files changed, 0 insertions, 150 deletions
diff --git a/ast/erfa/pmat76.c b/ast/erfa/pmat76.c deleted file mode 100644 index c38e6c4..0000000 --- a/ast/erfa/pmat76.c +++ /dev/null @@ -1,150 +0,0 @@ -#include "erfa.h" - -void eraPmat76(double date1, double date2, double rmatp[3][3]) -/* -** - - - - - - - - - - -** e r a P m a t 7 6 -** - - - - - - - - - - -** -** Precession matrix from J2000.0 to a specified date, IAU 1976 model. -** -** Given: -** date1,date2 double ending date, TT (Note 1) -** -** Returned: -** rmatp double[3][3] precession matrix, J2000.0 -> date1+date2 -** -** Notes: -** -** 1) The TT date date1+date2 is a Julian Date, apportioned in any -** convenient way between the two arguments. For example, -** JD(TT)=2450123.7 could be expressed in any of these ways, -** among others: -** -** date1 date2 -** -** 2450123.7 0.0 (JD method) -** 2451545.0 -1421.3 (J2000 method) -** 2400000.5 50123.2 (MJD method) -** 2450123.5 0.2 (date & time method) -** -** The JD method is the most natural and convenient to use in -** cases where the loss of several decimal digits of resolution -** is acceptable. The J2000 method is best matched to the way -** the argument is handled internally and will deliver the -** optimum resolution. The MJD method and the date & time methods -** are both good compromises between resolution and convenience. -** -** 2) The matrix operates in the sense V(date) = RMATP * V(J2000), -** where the p-vector V(J2000) is with respect to the mean -** equatorial triad of epoch J2000.0 and the p-vector V(date) -** is with respect to the mean equatorial triad of the given -** date. -** -** 3) Though the matrix method itself is rigorous, the precession -** angles are expressed through canonical polynomials which are -** valid only for a limited time span. In addition, the IAU 1976 -** precession rate is known to be imperfect. The absolute accuracy -** of the present formulation is better than 0.1 arcsec from -** 1960AD to 2040AD, better than 1 arcsec from 1640AD to 2360AD, -** and remains below 3 arcsec for the whole of the period -** 500BC to 3000AD. The errors exceed 10 arcsec outside the -** range 1200BC to 3900AD, exceed 100 arcsec outside 4200BC to -** 5600AD and exceed 1000 arcsec outside 6800BC to 8200AD. -** -** Called: -** eraPrec76 accumulated precession angles, IAU 1976 -** eraIr initialize r-matrix to identity -** eraRz rotate around Z-axis -** eraRy rotate around Y-axis -** eraCr copy r-matrix -** -** References: -** -** Lieske, J.H., 1979, Astron.Astrophys. 73, 282. -** equations (6) & (7), p283. -** -** Kaplan,G.H., 1981. USNO circular no. 163, pA2. -** -** Copyright (C) 2013-2016, NumFOCUS Foundation. -** Derived, with permission, from the SOFA library. See notes at end of file. -*/ -{ - double zeta, z, theta, wmat[3][3]; - - -/* Precession Euler angles, J2000.0 to specified date. */ - eraPrec76(ERFA_DJ00, 0.0, date1, date2, &zeta, &z, &theta); - -/* Form the rotation matrix. */ - eraIr( wmat); - eraRz( -zeta, wmat); - eraRy( theta, wmat); - eraRz( -z, wmat); - eraCr( wmat, rmatp); - - 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. -** -*/ |