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76 lines
2.4 KiB
Fortran
76 lines
2.4 KiB
Fortran
SUBROUTINE sla_DR2TF (NDP, ANGLE, SIGN, IHMSF)
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*+
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* - - - - - -
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* D R 2 T F
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* - - - - - -
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*
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* Convert an angle in radians to hours, minutes, seconds
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* (double precision)
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*
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* Given:
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* NDP i number of decimal places of seconds
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* ANGLE d angle in radians
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*
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* Returned:
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* SIGN c '+' or '-'
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* IHMSF i(4) hours, minutes, seconds, fraction
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*
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* Notes:
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*
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* 1) NDP less than zero is interpreted as zero.
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*
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* 2) The largest useful value for NDP is determined by the size
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* of ANGLE, the format of DOUBLE PRECISION floating-point
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* numbers on the target machine, and the risk of overflowing
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* IHMSF(4). On some architectures, for ANGLE up to 2pi, the
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* available floating-point precision corresponds roughly to
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* NDP=12. However, the practical limit is NDP=9, set by the
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* capacity of a typical 32-bit IHMSF(4).
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*
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* 3) The absolute value of ANGLE may exceed 2pi. In cases where it
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* does not, it is up to the caller to test for and handle the
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* case where ANGLE is very nearly 2pi and rounds up to 24 hours,
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* by testing for IHMSF(1)=24 and setting IHMSF(1-4) to zero.
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*
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* Called: sla_DD2TF
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*
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* Last revision: 26 December 2004
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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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INTEGER NDP
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DOUBLE PRECISION ANGLE
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CHARACTER SIGN*(*)
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INTEGER IHMSF(4)
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* Turns to radians
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DOUBLE PRECISION T2R
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PARAMETER (T2R=6.283185307179586476925287D0)
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* Scale then use days to h,m,s routine
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CALL sla_DD2TF(NDP,ANGLE/T2R,SIGN,IHMSF)
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END
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