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74 lines
1.8 KiB
Fortran
74 lines
1.8 KiB
Fortran
SUBROUTINE sla_KBJ (JB, E, K, J)
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*+
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* - - - -
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* K B J
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* - - - -
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*
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* Select epoch prefix 'B' or 'J'
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*
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* Given:
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* JB int sla_DBJIN prefix status: 0=none, 1='B', 2='J'
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* E dp epoch - Besselian or Julian
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*
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* Returned:
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* K char 'B' or 'J'
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* J int status: 0=OK
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*
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* If JB=0, B is assumed for E < 1984D0, otherwise J.
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*
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* P.T.Wallace Starlink 31 July 1989
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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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INTEGER JB
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DOUBLE PRECISION E
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CHARACTER K*(*)
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INTEGER J
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* Preset status
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J=0
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* If prefix given expressly, use it
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IF (JB.EQ.1) THEN
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K='B'
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ELSE IF (JB.EQ.2) THEN
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K='J'
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* If no prefix, examine the epoch
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ELSE IF (JB.EQ.0) THEN
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* If epoch is pre-1984.0, assume Besselian; otherwise Julian
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IF (E.LT.1984D0) THEN
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K='B'
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ELSE
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K='J'
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END IF
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* If illegal prefix, return error status
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ELSE
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K=' '
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J=1
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END IF
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END
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