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authorWilliam Joye <wjoye@cfa.harvard.edu>2016-11-02 19:11:06 (GMT)
committerWilliam Joye <wjoye@cfa.harvard.edu>2016-11-02 19:11:06 (GMT)
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-#include "erfa.h"
-
-double eraEe00a(double date1, double date2)
-/*
-** - - - - - - - - -
-** e r a E e 0 0 a
-** - - - - - - - - -
-**
-** Equation of the equinoxes, compatible with IAU 2000 resolutions.
-**
-** Given:
-** date1,date2 double TT as a 2-part Julian Date (Note 1)
-**
-** Returned (function value):
-** double equation of the equinoxes (Note 2)
-**
-** 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 result, which is in radians, operates in the following sense:
-**
-** Greenwich apparent ST = GMST + equation of the equinoxes
-**
-** 3) The result is compatible with the IAU 2000 resolutions. For
-** further details, see IERS Conventions 2003 and Capitaine et al.
-** (2002).
-**
-** Called:
-** eraPr00 IAU 2000 precession adjustments
-** eraObl80 mean obliquity, IAU 1980
-** eraNut00a nutation, IAU 2000A
-** eraEe00 equation of the equinoxes, IAU 2000
-**
-** References:
-**
-** Capitaine, N., Wallace, P.T. and McCarthy, D.D., "Expressions to
-** implement the IAU 2000 definition of UT1", Astronomy &
-** Astrophysics, 406, 1135-1149 (2003).
-**
-** McCarthy, D. D., Petit, G. (eds.), IERS Conventions (2003),
-** IERS Technical Note No. 32, BKG (2004).
-**
-** Copyright (C) 2013-2014, NumFOCUS Foundation.
-** Derived, with permission, from the SOFA library. See notes at end of file.
-*/
-{
- double dpsipr, depspr, epsa, dpsi, deps, ee;
-
-
-/* IAU 2000 precession-rate adjustments. */
- eraPr00(date1, date2, &dpsipr, &depspr);
-
-/* Mean obliquity, consistent with IAU 2000 precession-nutation. */
- epsa = eraObl80(date1, date2) + depspr;
-
-/* Nutation in longitude. */
- eraNut00a(date1, date2, &dpsi, &deps);
-
-/* Equation of the equinoxes. */
- ee = eraEe00(date1, date2, epsa, dpsi);
-
- return ee;
-
-}
-/*----------------------------------------------------------------------
-**
-**
-** Copyright (C) 2013-2014, 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.
-**
-*/