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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/apci13.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/apci13.c')
-rw-r--r-- | ast/erfa/apci13.c | 202 |
1 files changed, 0 insertions, 202 deletions
diff --git a/ast/erfa/apci13.c b/ast/erfa/apci13.c deleted file mode 100644 index c041652..0000000 --- a/ast/erfa/apci13.c +++ /dev/null @@ -1,202 +0,0 @@ -#include "erfa.h" - -void eraApci13(double date1, double date2, - eraASTROM *astrom, double *eo) -/* -** - - - - - - - - - - -** e r a A p c i 1 3 -** - - - - - - - - - - -** -** For a terrestrial observer, prepare star-independent astrometry -** parameters for transformations between ICRS and geocentric CIRS -** coordinates. The caller supplies the date, and ERFA models are used -** to predict the Earth ephemeris and CIP/CIO. -** -** The parameters produced by this function are required in the -** parallax, light deflection, aberration, and bias-precession-nutation -** parts of the astrometric transformation chain. -** -** Given: -** date1 double TDB as a 2-part... -** date2 double ...Julian Date (Note 1) -** -** Returned: -** astrom eraASTROM* star-independent astrometry parameters: -** pmt double PM time interval (SSB, Julian years) -** eb double[3] SSB to observer (vector, au) -** eh double[3] Sun to observer (unit vector) -** em double distance from Sun to observer (au) -** v double[3] barycentric observer velocity (vector, c) -** bm1 double sqrt(1-|v|^2): reciprocal of Lorenz factor -** bpn double[3][3] bias-precession-nutation matrix -** along double unchanged -** xpl double unchanged -** ypl double unchanged -** sphi double unchanged -** cphi double unchanged -** diurab double unchanged -** eral double unchanged -** refa double unchanged -** refb double unchanged -** eo double* equation of the origins (ERA-GST) -** -** Notes: -** -** 1) The TDB date date1+date2 is a Julian Date, apportioned in any -** convenient way between the two arguments. For example, -** JD(TDB)=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. For most -** applications of this function the choice will not be at all -** critical. -** -** TT can be used instead of TDB without any significant impact on -** accuracy. -** -** 2) All the vectors are with respect to BCRS axes. -** -** 3) In cases where the caller wishes to supply his own Earth -** ephemeris and CIP/CIO, the function eraApci can be used instead -** of the present function. -** -** 4) This is one of several functions that inserts into the astrom -** structure star-independent parameters needed for the chain of -** astrometric transformations ICRS <-> GCRS <-> CIRS <-> observed. -** -** The various functions support different classes of observer and -** portions of the transformation chain: -** -** functions observer transformation -** -** eraApcg eraApcg13 geocentric ICRS <-> GCRS -** eraApci eraApci13 terrestrial ICRS <-> CIRS -** eraApco eraApco13 terrestrial ICRS <-> observed -** eraApcs eraApcs13 space ICRS <-> GCRS -** eraAper eraAper13 terrestrial update Earth rotation -** eraApio eraApio13 terrestrial CIRS <-> observed -** -** Those with names ending in "13" use contemporary ERFA models to -** compute the various ephemerides. The others accept ephemerides -** supplied by the caller. -** -** The transformation from ICRS to GCRS covers space motion, -** parallax, light deflection, and aberration. From GCRS to CIRS -** comprises frame bias and precession-nutation. From CIRS to -** observed takes account of Earth rotation, polar motion, diurnal -** aberration and parallax (unless subsumed into the ICRS <-> GCRS -** transformation), and atmospheric refraction. -** -** 5) The context structure astrom produced by this function is used by -** eraAtciq* and eraAticq*. -** -** Called: -** eraEpv00 Earth position and velocity -** eraPnm06a classical NPB matrix, IAU 2006/2000A -** eraBpn2xy extract CIP X,Y coordinates from NPB matrix -** eraS06 the CIO locator s, given X,Y, IAU 2006 -** eraApci astrometry parameters, ICRS-CIRS -** eraEors equation of the origins, given NPB matrix and s -** -** Copyright (C) 2013-2016, NumFOCUS Foundation. -** Derived, with permission, from the SOFA library. See notes at end of file. -*/ -{ - double ehpv[2][3], ebpv[2][3], r[3][3], x, y, s; - - -/* Earth barycentric & heliocentric position/velocity (au, au/d). */ - (void) eraEpv00(date1, date2, ehpv, ebpv); - -/* Form the equinox based BPN matrix, IAU 2006/2000A. */ - eraPnm06a(date1, date2, r); - -/* Extract CIP X,Y. */ - eraBpn2xy(r, &x, &y); - -/* Obtain CIO locator s. */ - s = eraS06(date1, date2, x, y); - -/* Compute the star-independent astrometry parameters. */ - eraApci(date1, date2, ebpv, ehpv[0], x, y, s, astrom); - -/* Equation of the origins. */ - *eo = eraEors(r, s); - -/* Finished. */ - -} -/*---------------------------------------------------------------------- -** -** -** 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. -** -*/ |