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Diffstat (limited to 'ast/erfa/c2t06a.c')
| -rw-r--r-- | ast/erfa/c2t06a.c | 161 |
1 files changed, 0 insertions, 161 deletions
diff --git a/ast/erfa/c2t06a.c b/ast/erfa/c2t06a.c deleted file mode 100644 index 3b8b2ff..0000000 --- a/ast/erfa/c2t06a.c +++ /dev/null @@ -1,161 +0,0 @@ -#include "erfa.h" - -void eraC2t06a(double tta, double ttb, double uta, double utb, - double xp, double yp, double rc2t[3][3]) -/* -** - - - - - - - - - - -** e r a C 2 t 0 6 a -** - - - - - - - - - - -** -** Form the celestial to terrestrial matrix given the date, the UT1 and -** the polar motion, using the IAU 2006 precession and IAU 2000A -** nutation models. -** -** Given: -** tta,ttb double TT as a 2-part Julian Date (Note 1) -** uta,utb double UT1 as a 2-part Julian Date (Note 1) -** xp,yp double coordinates of the pole (radians, Note 2) -** -** Returned: -** rc2t double[3][3] celestial-to-terrestrial matrix (Note 3) -** -** Notes: -** -** 1) The TT and UT1 dates tta+ttb and uta+utb are Julian Dates, -** apportioned in any convenient way between the arguments uta and -** utb. For example, JD(UT1)=2450123.7 could be expressed in any of -** these ways, among others: -** -** uta utb -** -** 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. In the case of uta,utb, the -** date & time method is best matched to the Earth rotation angle -** algorithm used: maximum precision is delivered when the uta -** argument is for 0hrs UT1 on the day in question and the utb -** argument lies in the range 0 to 1, or vice versa. -** -** 2) The arguments xp and yp are the coordinates (in radians) of the -** Celestial Intermediate Pole with respect to the International -** Terrestrial Reference System (see IERS Conventions 2003), -** measured along the meridians to 0 and 90 deg west respectively. -** -** 3) The matrix rc2t transforms from celestial to terrestrial -** coordinates: -** -** [TRS] = RPOM * R_3(ERA) * RC2I * [CRS] -** -** = rc2t * [CRS] -** -** where [CRS] is a vector in the Geocentric Celestial Reference -** System and [TRS] is a vector in the International Terrestrial -** Reference System (see IERS Conventions 2003), RC2I is the -** celestial-to-intermediate matrix, ERA is the Earth rotation -** angle and RPOM is the polar motion matrix. -** -** Called: -** eraC2i06a celestial-to-intermediate matrix, IAU 2006/2000A -** eraEra00 Earth rotation angle, IAU 2000 -** eraSp00 the TIO locator s', IERS 2000 -** eraPom00 polar motion matrix -** eraC2tcio form CIO-based celestial-to-terrestrial matrix -** -** Reference: -** -** McCarthy, D. D., Petit, G. (eds.), 2004, IERS Conventions (2003), -** IERS Technical Note No. 32, BKG -** -** Copyright (C) 2013-2016, NumFOCUS Foundation. -** Derived, with permission, from the SOFA library. See notes at end of file. -*/ -{ - double rc2i[3][3], era, sp, rpom[3][3]; - - -/* Form the celestial-to-intermediate matrix for this TT. */ - eraC2i06a(tta, ttb, rc2i); - -/* Predict the Earth rotation angle for this UT1. */ - era = eraEra00(uta, utb); - -/* Estimate s'. */ - sp = eraSp00(tta, ttb); - -/* Form the polar motion matrix. */ - eraPom00(xp, yp, sp, rpom); - -/* Combine to form the celestial-to-terrestrial matrix. */ - eraC2tcio(rc2i, era, rpom, rc2t); - - 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. -** -*/ |