=========================== ============================ IMCCE - Observatoire de Paris PRECESSION-NUTATION SOLUTION SMART97 December 1997 =========================== ============================ These files and programs are associated to : SMART97 : a new solution for the rotation of the rigid Earth. Bretagnon P., Francou G., Rocher P., Simon J.-L. Astron. Astrophys. 329, 329 (1998). Theory of the rotation of the rigid Earth. Bretagnon P., Rocher P., Simon J.-L. Astron. Astrophys. 319, 305 (1997). ================================================================================ Description: The Earth rotation solution SMART97 (Solution du Mouvement de l'Axe de Rotation de la Terre) is an analytical solution of the Earth rotation in the rigid case. It gives the expressions of precession-nutation and rotation of the Earth for the 3 Euler angles psi, omega, phi as well as for the quantities p, epsilon, chi, and the sidereal time. For the axis of figure (fig), these 7 quantities are given in the dynamical system (dyn) and in the kinematical system (kin). SMART97 also gives the variables psi and omega, in the dynamical system, for the differences (axis of figure - axis of rotation) (rot) and (axis of figure - axis of the angular momentum) (ang). The accuracy of the solution is better than 2.2 microarcseconds for all these variables over 20000 days, between 1968 and 2023. Authors' Address: P. Bretagnon, G. Francou, P. Rocher, J.-L. Simon IMCCE - Observatoire de Paris 77, Avenue Denfert-Rochereau 75014, Paris, France Tel : (33) 1 40 51 22 69 (33) 1 40 51 22 60 (33) 1 40 51 22 72 (33) 1 40 51 22 63 Fax : (33) 1 46 33 28 34 E-mail : pierre@imcce.fr francou@imcce.fr rocher@imcce.fr simon@imcce.fr Contents: The SMART97 solutions are given for the axis of figure, the axis of rotation, and the axis of the angular momentum, in the dynamical system and the kinematical system. A program EXAMPLE (Fortran 77) is provided which makes use of the subroutine SMART97 which substitutes the time in the series of the solutions SMART97. File Summary: -------------------------------------------------------------------------------- FileName Lrecl Records Explanations -------------------------------------------------------------------------------- README 80 . This file smart97.doc 80 223 Notice for use of SMART97 files smart97.f 72 49 Fortran77 subroutine SMART97 (time substitution) example.f 72 144 Fortran77 program example of use of SMART97 smart97.chk 98 57 Results of substitution of time in SMART97 series figdyn97.psi 141 4938 axis of figure in the dynamical reference system, variable psi figdyn97.omega 141 4388 axis of figure in the dynamical reference system, variable omega figdyn97.phi 141 4763 axis of figure in the dynamical reference system, variable phi figdyn97.p 141 4929 axis of figure in the dynamical reference system, variable p figdyn97.epsilon 141 4382 axis of figure in the dynamical reference system, variable epsilon figdyn97.chi 141 244 axis of figure in the dynamical reference system, variable chi figdyn97.sidtime 141 4766 axis of figure in the dynamical reference system, variable sidereal time figkin97.psi 141 4938 axis of figure in the kinematical reference system, variable psi figkin97.omega 141 4388 axis of figure in the kinematical reference system, variable omega figkin97.phi 141 4763 axis of figure in the kinematical reference system, variable phi figkin97.p 141 4929 axis of figure in the kinematical reference system, variable p figkin97.epsilon 141 4382 axis of figure in the kinematical reference system, variable epsilon figkin97.chi 141 244 axis of figure in the kinematical reference system, variable chi figkin97.sidtime 141 4766 axis of figure in the kinematical reference system, variable sidereal time rotdyn97.psi 141 1359 (axis of figure - axis of rotation) in the dynamical reference system, variable psi rotdyn97.omega 141 1465 (axis of figure - axis of rotation) in the dynamical reference system, variable omega angdyn97.psi 141 1358 (axis of figure - axis of the angular momentum) in the dynamical reference system, variable psi angdyn97.omega 141 1462 (axis of figure - axis of the angular momentum) in the dynamical reference system, variable omega -------------------------------------------------------------------------------- Remarks: The subroutine SMART97 and the program EXAMPLE (Fortran 77) are provided to simply illustrate the computation of a precession-nutation series. If the user wants to improve the rapidity of computation, it is recommended to transform files in direct access. ================================================================================ User feed-back is encouraged. Unless otherwise specified, send comments and bug reports to: E-mail : comments@imcce.fr Fax : (33) 1 46 33 28 34 Postal mail: IMCCE - Observatoire de Paris 77 avenue Denfert Rochereau F-75014 PARIS ================================================================================