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author | Joseph Hunkeler <jhunkeler@gmail.com> | 2015-07-08 20:46:52 -0400 |
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committer | Joseph Hunkeler <jhunkeler@gmail.com> | 2015-07-08 20:46:52 -0400 |
commit | fa080de7afc95aa1c19a6e6fc0e0708ced2eadc4 (patch) | |
tree | bdda434976bc09c864f2e4fa6f16ba1952b1e555 /math/slalib/dr2af.f | |
download | iraf-linux-fa080de7afc95aa1c19a6e6fc0e0708ced2eadc4.tar.gz |
Initial commit
Diffstat (limited to 'math/slalib/dr2af.f')
-rw-r--r-- | math/slalib/dr2af.f | 76 |
1 files changed, 76 insertions, 0 deletions
diff --git a/math/slalib/dr2af.f b/math/slalib/dr2af.f new file mode 100644 index 00000000..155f1f6b --- /dev/null +++ b/math/slalib/dr2af.f @@ -0,0 +1,76 @@ + SUBROUTINE slDRAF (NDP, ANGLE, SIGN, IDMSF) +*+ +* - - - - - - +* D R A F +* - - - - - - +* +* Convert an angle in radians to degrees, arcminutes, arcseconds +* (double precision) +* +* Given: +* NDP i number of decimal places of arcseconds +* ANGLE d angle in radians +* +* Returned: +* SIGN c '+' or '-' +* IDMSF i(4) degrees, arcminutes, arcseconds, fraction +* +* Notes: +* +* 1) NDP less than zero is interpreted as zero. +* +* 2) The largest useful value for NDP is determined by the size +* of ANGLE, the format of DOUBLE PRECISION floating-point +* numbers on the target machine, and the risk of overflowing +* IDMSF(4). On some architectures, for ANGLE up to 2pi, the +* available floating-point precision corresponds roughly to +* NDP=12. However, the practical limit is NDP=9, set by the +* capacity of a typical 32-bit IDMSF(4). +* +* 3) The absolute value of ANGLE may exceed 2pi. In cases where it +* does not, it is up to the caller to test for and handle the +* case where ANGLE is very nearly 2pi and rounds up to 360 deg, +* by testing for IDMSF(1)=360 and setting IDMSF(1-4) to zero. +* +* Called: slDDTF +* +* Last revision: 26 December 2004 +* +* Copyright P.T.Wallace. All rights reserved. +* +* License: +* This program is free software; you can redistribute it and/or modify +* it under the terms of the GNU General Public License as published by +* the Free Software Foundation; either version 2 of the License, or +* (at your option) any later version. +* +* This program is distributed in the hope that it will be useful, +* but WITHOUT ANY WARRANTY; without even the implied warranty of +* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +* GNU General Public License for more details. +* +* You should have received a copy of the GNU General Public License +* along with this program (see SLA_CONDITIONS); if not, write to the +* Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, +* Boston, MA 02110-1301 USA +* +* Copyright (C) 1995 Association of Universities for Research in Astronomy Inc. +*- + + IMPLICIT NONE + + INTEGER NDP + DOUBLE PRECISION ANGLE + CHARACTER SIGN*(*) + INTEGER IDMSF(4) + +* Hours to degrees * radians to turns + DOUBLE PRECISION F + PARAMETER (F=15D0/6.283185307179586476925287D0) + + + +* Scale then use days to h,m,s routine + CALL slDDTF(NDP,ANGLE*F,SIGN,IDMSF) + + END |