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