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73 lines
2.1 KiB
Fortran
73 lines
2.1 KiB
Fortran
SUBROUTINE sla_ECLEQ (DL, DB, DATE, DR, DD)
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*+
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* - - - - - -
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* E C L E Q
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* - - - - - -
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*
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* Transformation from ecliptic coordinates to
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* J2000.0 equatorial coordinates (double precision)
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*
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* Given:
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* DL,DB dp ecliptic longitude and latitude
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* (mean of date, IAU 1980 theory, radians)
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* DATE dp TDB (loosely ET) as Modified Julian Date
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* (JD-2400000.5)
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* Returned:
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* DR,DD dp J2000.0 mean RA,Dec (radians)
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*
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* Called:
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* sla_DCS2C, sla_ECMAT, sla_DIMXV, sla_PREC, sla_EPJ, sla_DCC2S,
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* sla_DRANRM, sla_DRANGE
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*
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* P.T.Wallace Starlink March 1986
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*
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* Copyright (C) 1995 Rutherford Appleton Laboratory
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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 DL,DB,DATE,DR,DD
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DOUBLE PRECISION sla_EPJ,sla_DRANRM,sla_DRANGE
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DOUBLE PRECISION RMAT(3,3),V1(3),V2(3)
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* Spherical to Cartesian
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CALL sla_DCS2C(DL,DB,V1)
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* Ecliptic to equatorial
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CALL sla_ECMAT(DATE,RMAT)
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CALL sla_DIMXV(RMAT,V1,V2)
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* Mean of date to J2000
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CALL sla_PREC(2000D0,sla_EPJ(DATE),RMAT)
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CALL sla_DIMXV(RMAT,V2,V1)
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* Cartesian to spherical
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CALL sla_DCC2S(V1,DR,DD)
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* Express in conventional ranges
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DR=sla_DRANRM(DR)
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DD=sla_DRANGE(DD)
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END
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