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Diffstat (limited to 'ast/erfa/pfw06.c')
| -rw-r--r-- | ast/erfa/pfw06.c | 174 |
1 files changed, 0 insertions, 174 deletions
diff --git a/ast/erfa/pfw06.c b/ast/erfa/pfw06.c deleted file mode 100644 index b510f0a..0000000 --- a/ast/erfa/pfw06.c +++ /dev/null @@ -1,174 +0,0 @@ -#include "erfa.h" - -void eraPfw06(double date1, double date2, - double *gamb, double *phib, double *psib, double *epsa) -/* -** - - - - - - - - - -** e r a P f w 0 6 -** - - - - - - - - - -** -** Precession angles, IAU 2006 (Fukushima-Williams 4-angle formulation). -** -** Given: -** date1,date2 double TT as a 2-part Julian Date (Note 1) -** -** Returned: -** gamb double F-W angle gamma_bar (radians) -** phib double F-W angle phi_bar (radians) -** psib double F-W angle psi_bar (radians) -** epsa double F-W angle epsilon_A (radians) -** -** 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) Naming the following points: -** -** e = J2000.0 ecliptic pole, -** p = GCRS pole, -** E = mean ecliptic pole of date, -** and P = mean pole of date, -** -** the four Fukushima-Williams angles are as follows: -** -** gamb = gamma_bar = epE -** phib = phi_bar = pE -** psib = psi_bar = pEP -** epsa = epsilon_A = EP -** -** 3) The matrix representing the combined effects of frame bias and -** precession is: -** -** PxB = R_1(-epsa).R_3(-psib).R_1(phib).R_3(gamb) -** -** 4) The matrix representing the combined effects of frame bias, -** precession and nutation is simply: -** -** NxPxB = R_1(-epsa-dE).R_3(-psib-dP).R_1(phib).R_3(gamb) -** -** where dP and dE are the nutation components with respect to the -** ecliptic of date. -** -** Reference: -** -** Hilton, J. et al., 2006, Celest.Mech.Dyn.Astron. 94, 351 -** -** Called: -** eraObl06 mean obliquity, IAU 2006 -** -** Copyright (C) 2013-2016, NumFOCUS Foundation. -** Derived, with permission, from the SOFA library. See notes at end of file. -*/ -{ - double t; - - -/* Interval between fundamental date J2000.0 and given date (JC). */ - t = ((date1 - ERFA_DJ00) + date2) / ERFA_DJC; - -/* P03 bias+precession angles. */ - *gamb = ( -0.052928 + - ( 10.556378 + - ( 0.4932044 + - ( -0.00031238 + - ( -0.000002788 + - ( 0.0000000260 ) - * t) * t) * t) * t) * t) * ERFA_DAS2R; - *phib = ( 84381.412819 + - ( -46.811016 + - ( 0.0511268 + - ( 0.00053289 + - ( -0.000000440 + - ( -0.0000000176 ) - * t) * t) * t) * t) * t) * ERFA_DAS2R; - *psib = ( -0.041775 + - ( 5038.481484 + - ( 1.5584175 + - ( -0.00018522 + - ( -0.000026452 + - ( -0.0000000148 ) - * t) * t) * t) * t) * t) * ERFA_DAS2R; - *epsa = eraObl06(date1, date2); - - 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. -** -*/ |