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SUBROUTINE sla_PRENUT (EPOCH, DATE, RMATPN)
*+
* - - - - - - -
* P R E N U T
* - - - - - - -
*
* Form the matrix of precession and nutation (IAU1976/FK5)
* (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).
*
* 2) The matrix is in the sense V(true) = RMATPN * V(mean)
*
* P.T.Wallace Starlink April 1987
*
* Copyright (C) 1995 Rutherford Appleton Laboratory
*-
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
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