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Diffstat (limited to 'ast/erfa/bp00.c')
| -rw-r--r-- | ast/erfa/bp00.c | 181 |
1 files changed, 0 insertions, 181 deletions
diff --git a/ast/erfa/bp00.c b/ast/erfa/bp00.c deleted file mode 100644 index dd387ea..0000000 --- a/ast/erfa/bp00.c +++ /dev/null @@ -1,181 +0,0 @@ -#include "erfa.h" - -void eraBp00(double date1, double date2, - double rb[3][3], double rp[3][3], double rbp[3][3]) -/* -** - - - - - - - - -** e r a B p 0 0 -** - - - - - - - - -** -** Frame bias and precession, IAU 2000. -** -** Given: -** date1,date2 double TT as a 2-part Julian Date (Note 1) -** -** Returned: -** rb double[3][3] frame bias matrix (Note 2) -** rp double[3][3] precession matrix (Note 3) -** rbp double[3][3] bias-precession matrix (Note 4) -** -** 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 rb transforms vectors from GCRS to mean J2000.0 by -** applying frame bias. -** -** 3) The matrix rp transforms vectors from J2000.0 mean equator and -** equinox to mean equator and equinox of date by applying -** precession. -** -** 4) The matrix rbp transforms vectors from GCRS to mean equator and -** equinox of date by applying frame bias then precession. It is -** the product rp x rb. -** -** 5) It is permissible to re-use the same array in the returned -** arguments. The arrays are filled in the order given. -** -** Called: -** eraBi00 frame bias components, IAU 2000 -** eraPr00 IAU 2000 precession adjustments -** eraIr initialize r-matrix to identity -** eraRx rotate around X-axis -** eraRy rotate around Y-axis -** eraRz rotate around Z-axis -** eraCr copy r-matrix -** eraRxr product of two r-matrices -** -** Reference: -** "Expressions for the Celestial Intermediate Pole and Celestial -** Ephemeris Origin consistent with the IAU 2000A precession- -** nutation model", Astron.Astrophys. 400, 1145-1154 (2003) -** -** n.b. The celestial ephemeris origin (CEO) was renamed "celestial -** intermediate origin" (CIO) by IAU 2006 Resolution 2. -** -** Copyright (C) 2013-2016, NumFOCUS Foundation. -** Derived, with permission, from the SOFA library. See notes at end of file. -*/ -{ -/* J2000.0 obliquity (Lieske et al. 1977) */ - const double EPS0 = 84381.448 * ERFA_DAS2R; - - double t, dpsibi, depsbi, dra0, psia77, oma77, chia, - dpsipr, depspr, psia, oma, rbw[3][3]; - - -/* Interval between fundamental epoch J2000.0 and current date (JC). */ - t = ((date1 - ERFA_DJ00) + date2) / ERFA_DJC; - -/* Frame bias. */ - eraBi00(&dpsibi, &depsbi, &dra0); - -/* Precession angles (Lieske et al. 1977) */ - psia77 = (5038.7784 + (-1.07259 + (-0.001147) * t) * t) * t * ERFA_DAS2R; - oma77 = EPS0 + ((0.05127 + (-0.007726) * t) * t) * t * ERFA_DAS2R; - chia = ( 10.5526 + (-2.38064 + (-0.001125) * t) * t) * t * ERFA_DAS2R; - -/* Apply IAU 2000 precession corrections. */ - eraPr00(date1, date2, &dpsipr, &depspr); - psia = psia77 + dpsipr; - oma = oma77 + depspr; - -/* Frame bias matrix: GCRS to J2000.0. */ - eraIr(rbw); - eraRz(dra0, rbw); - eraRy(dpsibi*sin(EPS0), rbw); - eraRx(-depsbi, rbw); - eraCr(rbw, rb); - -/* Precession matrix: J2000.0 to mean of date. */ - eraIr(rp); - eraRx(EPS0, rp); - eraRz(-psia, rp); - eraRx(-oma, rp); - eraRz(chia, rp); - -/* Bias-precession matrix: GCRS to mean of date. */ - eraRxr(rp, rbw, rbp); - - 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. -** -*/ |