Permalink
Find file
Fetching contributors…
Cannot retrieve contributors at this time
67 lines (57 sloc) 1.8 KB
SUBROUTINE sla_PRENUT (EPOCH, DATE, RMATPN)
*+
* - - - - - - -
* P R E N U T
* - - - - - - -
*
* Form the matrix of precession and nutation (SF2001)
* (double precision)
*
* Given:
* EPOCH dp Julian Epoch for mean coordinates
* DATE dp Modified Julian Date (JD-2400000.5)
* for true coordinates
*
* Returned:
* RMATPN dp(3,3) combined precession/nutation matrix
*
* Called: sla_PREC, sla_EPJ, sla_NUT, sla_DMXM
*
* Notes:
*
* 1) The epoch and date are TDB (loosely ET). TT will do, or even
* UTC.
*
* 2) The matrix is in the sense V(true) = RMATPN * V(mean)
*
* Last revision: 3 December 2005
*
* Copyright P.T.Wallace. All rights reserved.
*
* License:
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program (see SLA_CONDITIONS); if not, write to the
* Free Software Foundation, Inc., 59 Temple Place, Suite 330,
* Boston, MA 02111-1307 USA
*
*-
IMPLICIT NONE
DOUBLE PRECISION EPOCH,DATE,RMATPN(3,3)
DOUBLE PRECISION RMATP(3,3),RMATN(3,3),sla_EPJ
* Precession
CALL sla_PREC(EPOCH,sla_EPJ(DATE),RMATP)
* Nutation
CALL sla_NUT(DATE,RMATN)
* Combine the matrices: PN = N x P
CALL sla_DMXM(RMATN,RMATP,RMATPN)
END