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Diffstat (limited to 'ast/erfa/era00.c')
-rw-r--r-- | ast/erfa/era00.c | 145 |
1 files changed, 0 insertions, 145 deletions
diff --git a/ast/erfa/era00.c b/ast/erfa/era00.c deleted file mode 100644 index 01e06f5..0000000 --- a/ast/erfa/era00.c +++ /dev/null @@ -1,145 +0,0 @@ -#include "erfa.h" - -double eraEra00(double dj1, double dj2) -/* -** - - - - - - - - - -** e r a E r a 0 0 -** - - - - - - - - - -** -** Earth rotation angle (IAU 2000 model). -** -** Given: -** dj1,dj2 double UT1 as a 2-part Julian Date (see note) -** -** Returned (function value): -** double Earth rotation angle (radians), range 0-2pi -** -** Notes: -** -** 1) The UT1 date dj1+dj2 is a Julian Date, apportioned in any -** convenient way between the arguments dj1 and dj2. For example, -** JD(UT1)=2450123.7 could be expressed in any of these ways, -** among others: -** -** dj1 dj2 -** -** 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 and MJD methods are good compromises -** between resolution and convenience. The date & time method is -** best matched to the algorithm used: maximum precision is -** delivered when the dj1 argument is for 0hrs UT1 on the day in -** question and the dj2 argument lies in the range 0 to 1, or vice -** versa. -** -** 2) The algorithm is adapted from Expression 22 of Capitaine et al. -** 2000. The time argument has been expressed in days directly, -** and, to retain precision, integer contributions have been -** eliminated. The same formulation is given in IERS Conventions -** (2003), Chap. 5, Eq. 14. -** -** Called: -** eraAnp normalize angle into range 0 to 2pi -** -** References: -** -** Capitaine N., Guinot B. and McCarthy D.D, 2000, Astron. -** Astrophys., 355, 398-405. -** -** McCarthy, D. D., Petit, G. (eds.), IERS Conventions (2003), -** IERS Technical Note No. 32, BKG (2004) -** -** Copyright (C) 2013-2016, NumFOCUS Foundation. -** Derived, with permission, from the SOFA library. See notes at end of file. -*/ -{ - double d1, d2, t, f, theta; - - -/* Days since fundamental epoch. */ - if (dj1 < dj2) { - d1 = dj1; - d2 = dj2; - } else { - d1 = dj2; - d2 = dj1; - } - t = d1 + (d2- ERFA_DJ00); - -/* Fractional part of T (days). */ - f = fmod(d1, 1.0) + fmod(d2, 1.0); - -/* Earth rotation angle at this UT1. */ - theta = eraAnp(ERFA_D2PI * (f + 0.7790572732640 - + 0.00273781191135448 * t)); - - return theta; - -} -/*---------------------------------------------------------------------- -** -** -** 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. -** -*/ |