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76 lines
2.4 KiB
Fortran
76 lines
2.4 KiB
Fortran
SUBROUTINE sla_CR2AF (NDP, ANGLE, SIGN, IDMSF)
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*+
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* - - - - - -
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* C R 2 A F
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* - - - - - -
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*
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* Convert an angle in radians into degrees, arcminutes, arcseconds
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* (single precision)
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*
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* Given:
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* NDP int number of decimal places of arcseconds
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* ANGLE real angle in radians
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*
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* Returned:
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* SIGN char '+' or '-'
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* IDMSF int(4) degrees, arcminutes, arcseconds, 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 of
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* ANGLE, the format of REAL floating-point numbers on the target
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* machine, and the risk of overflowing IDMSF(4). On some
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* architectures, for ANGLE up to 2pi, the available floating-
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* point precision corresponds roughly to NDP=3. This is well
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* below the ultimate limit of NDP=9 set by the capacity of a
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* typical 32-bit IDMSF(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 360 deg,
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* by testing for IDMSF(1)=360 and setting IDMSF(1-4) to zero.
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*
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* Called: sla_CD2TF
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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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REAL ANGLE
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CHARACTER SIGN*(*)
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INTEGER IDMSF(4)
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* Hours to degrees * radians to turns
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REAL F
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PARAMETER (F=15.0/6.283185307179586476925287)
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* Scale then use days to h,m,s routine
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CALL sla_CD2TF(NDP,ANGLE*F,SIGN,IDMSF)
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END
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