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authorWilliam Joye <wjoye@cfa.harvard.edu>2019-05-10 16:22:37 (GMT)
committerWilliam Joye <wjoye@cfa.harvard.edu>2019-05-10 16:22:37 (GMT)
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upgrade ast 8.7.1
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-#include "erfa.h"
-
-void eraAtic13(double ri, double di, double date1, double date2,
- double *rc, double *dc, double *eo)
-/*
-** - - - - - - - - - -
-** e r a A t i c 1 3
-** - - - - - - - - - -
-**
-** Transform star RA,Dec from geocentric CIRS to ICRS astrometric.
-**
-** Given:
-** ri,di double CIRS geocentric RA,Dec (radians)
-** date1 double TDB as a 2-part...
-** date2 double ...Julian Date (Note 1)
-**
-** Returned:
-** rc,dc double ICRS astrometric RA,Dec (radians)
-** eo double equation of the origins (ERA-GST, Note 4)
-**
-** 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) Iterative techniques are used for the aberration and light
-** deflection corrections so that the functions eraAtic13 (or
-** eraAticq) and eraAtci13 (or eraAtciq) are accurate inverses;
-** even at the edge of the Sun's disk the discrepancy is only about
-** 1 nanoarcsecond.
-**
-** 3) The available accuracy is better than 1 milliarcsecond, limited
-** mainly by the precession-nutation model that is used, namely
-** IAU 2000A/2006. Very close to solar system bodies, additional
-** errors of up to several milliarcseconds can occur because of
-** unmodeled light deflection; however, the Sun's contribution is
-** taken into account, to first order. The accuracy limitations of
-** the ERFA function eraEpv00 (used to compute Earth position and
-** velocity) can contribute aberration errors of up to
-** 5 microarcseconds. Light deflection at the Sun's limb is
-** uncertain at the 0.4 mas level.
-**
-** 4) Should the transformation to (equinox based) J2000.0 mean place
-** be required rather than (CIO based) ICRS coordinates, subtract the
-** equation of the origins from the returned right ascension:
-** RA = RI - EO. (The eraAnp function can then be applied, as
-** required, to keep the result in the conventional 0-2pi range.)
-**
-** Called:
-** eraApci13 astrometry parameters, ICRS-CIRS, 2013
-** eraAticq quick CIRS to ICRS astrometric
-**
-** Copyright (C) 2013-2016, NumFOCUS Foundation.
-** Derived, with permission, from the SOFA library. See notes at end of file.
-*/
-{
-/* Star-independent astrometry parameters */
- eraASTROM astrom;
-
-
-/* Star-independent astrometry parameters. */
- eraApci13(date1, date2, &astrom, eo);
-
-/* CIRS to ICRS astrometric. */
- eraAticq(ri, di, &astrom, rc, dc);
-
-/* 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.
-**
-*/