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69 lines
2.1 KiB
Fortran
69 lines
2.1 KiB
Fortran
DOUBLE PRECISION FUNCTION sla_EPCO (K0, K, E)
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*+
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* - - - - -
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* E P C O
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* - - - - -
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*
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* Convert an epoch into the appropriate form - 'B' or 'J'
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*
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* Given:
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* K0 char form of result: 'B'=Besselian, 'J'=Julian
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* K char form of given epoch: 'B' or 'J'
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* E dp epoch
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*
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* Called: sla_EPB, sla_EPJ2D, sla_EPJ, sla_EPB2D
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*
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* Notes:
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*
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* 1) The result is always either equal to or very close to
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* the given epoch E. The routine is required only in
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* applications where punctilious treatment of heterogeneous
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* mixtures of star positions is necessary.
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*
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* 2) K0 and K are not validated. They are interpreted as follows:
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*
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* o If K0 and K are the same the result is E.
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* o If K0 is 'B' or 'b' and K isn't, the conversion is J to B.
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* o In all other cases, the conversion is B to J.
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*
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* Note that K0 and K won't match if their cases differ.
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*
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* P.T.Wallace Starlink 5 September 1993
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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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CHARACTER*(*) K0,K
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DOUBLE PRECISION E
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DOUBLE PRECISION sla_EPB,sla_EPJ2D,sla_EPJ,sla_EPB2D
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IF (K.EQ.K0) THEN
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sla_EPCO=E
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ELSE IF (K0.EQ.'B'.OR.K0.EQ.'b') THEN
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sla_EPCO=sla_EPB(sla_EPJ2D(E))
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ELSE
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sla_EPCO=sla_EPJ(sla_EPB2D(E))
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END IF
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END
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