#include "sofam.h" void iauNumat(double epsa, double dpsi, double deps, double rmatn[3][3]) /* ** - - - - - - - - - ** i a u N u m a t ** - - - - - - - - - ** ** Form the matrix of nutation. ** ** This function is part of the International Astronomical Union's ** SOFA (Standards Of Fundamental Astronomy) software collection. ** ** Status: support function. ** ** Given: ** epsa double mean obliquity of date (Note 1) ** dpsi,deps double nutation (Note 2) ** ** Returned: ** rmatn double[3][3] nutation matrix (Note 3) ** ** Notes: ** ** ** 1) The supplied mean obliquity epsa, must be consistent with the ** precession-nutation models from which dpsi and deps were obtained. ** ** 2) The caller is responsible for providing the nutation components; ** they are in longitude and obliquity, in radians and are with ** respect to the equinox and ecliptic of date. ** ** 3) The matrix operates in the sense V(true) = rmatn * V(mean), ** where the p-vector V(true) is with respect to the true ** equatorial triad of date and the p-vector V(mean) is with ** respect to the mean equatorial triad of date. ** ** Called: ** iauIr initialize r-matrix to identity ** iauRx rotate around X-axis ** iauRz rotate around Z-axis ** ** Reference: ** ** Explanatory Supplement to the Astronomical Almanac, ** P. Kenneth Seidelmann (ed), University Science Books (1992), ** Section 3.222-3 (p114). ** ** This revision: 2008 May 11 ** ** SOFA release 2009-12-31 ** ** Copyright (C) 2009 IAU SOFA Review Board. See notes at end. */ { /* Build the rotation matrix. */ iauIr(rmatn); iauRx(epsa, rmatn); iauRz(-dpsi, rmatn); iauRx(-(epsa + deps), rmatn); return; /*---------------------------------------------------------------------- ** ** Copyright (C) 2009 ** Standards Of Fundamental Astronomy Review Board ** of the International Astronomical Union. ** ** ===================== ** SOFA Software License ** ===================== ** ** NOTICE TO USER: ** ** BY USING THIS SOFTWARE YOU ACCEPT THE FOLLOWING TERMS AND CONDITIONS ** WHICH APPLY TO ITS USE. ** ** 1. The Software is owned by the IAU SOFA Review Board ("SOFA"). ** ** 2. Permission is granted to anyone to use the SOFA software for any ** purpose, including commercial applications, free of charge and ** without payment of royalties, subject to the conditions and ** restrictions listed below. ** ** 3. You (the user) may copy and distribute SOFA source code to others, ** and use and adapt its code and algorithms in your own software, ** on a world-wide, royalty-free basis. That portion of your ** distribution that does not consist of intact and unchanged copies ** of SOFA source code files is a "derived work" that must comply ** with the following requirements: ** ** a) Your work shall be marked or carry a statement that it ** (i) uses routines and computations derived by you from ** software provided by SOFA under license to you; and ** (ii) does not itself constitute software provided by and/or ** endorsed by SOFA. ** ** b) The source code of your derived work must contain descriptions ** of how the derived work is based upon, contains and/or differs ** from the original SOFA software. ** ** c) The name(s) of all routine(s) in your derived work shall not ** include the prefix "iau_". ** ** d) The origin of the SOFA components of your derived work must ** not be misrepresented; you must not claim that you wrote the ** original software, nor file a patent application for SOFA ** software or algorithms embedded in the SOFA software. ** ** e) These requirements must be reproduced intact in any source ** distribution and shall apply to anyone to whom you have ** granted a further right to modify the source code of your ** derived work. ** ** Note that, as originally distributed, the SOFA software is ** intended to be a definitive implementation of the IAU standards, ** and consequently third-party modifications are discouraged. All ** variations, no matter how minor, must be explicitly marked as ** such, as explained above. ** ** 4. In any published work or commercial products which includes ** results achieved by using the SOFA software, you shall ** acknowledge that the SOFA software was used in obtaining those ** results. ** ** 5. You shall not cause the SOFA software to be brought into ** disrepute, either by misuse, or use for inappropriate tasks, or ** by inappropriate modification. ** ** 6. The SOFA software is provided "as is" and SOFA makes no warranty ** as to its use or performance. SOFA does not and cannot warrant ** the performance or results which the user may obtain by using the ** SOFA software. SOFA makes no warranties, express or implied, as ** to non-infringement of third party rights, merchantability, or ** fitness for any particular purpose. In no event will SOFA be ** liable to the user for any consequential, incidental, or special ** damages, including any lost profits or lost savings, even if a ** SOFA representative has been advised of such damages, or for any ** claim by any third party. ** ** 7. The provision of any version of the SOFA software under the terms ** and conditions specified herein does not imply that future ** versions will also be made available under the same terms and ** conditions. ** ** Correspondence concerning SOFA software should be addressed as ** follows: ** ** By email: sofa@rl.ac.uk ** By post: IAU SOFA Center ** STFC Rutherford Appleton Laboratory ** Harwell Science and Innovation Campus ** Didcot, Oxfordshire, OX11 0QX ** United Kingdom ** **--------------------------------------------------------------------*/ }