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Diffstat (limited to 'math/slalib/sep.f')
| -rw-r--r-- | math/slalib/sep.f | 56 |
1 files changed, 56 insertions, 0 deletions
diff --git a/math/slalib/sep.f b/math/slalib/sep.f new file mode 100644 index 00000000..100de493 --- /dev/null +++ b/math/slalib/sep.f @@ -0,0 +1,56 @@ + REAL FUNCTION slSEP (A1, B1, A2, B2) +*+ +* - - - - +* S E P +* - - - - +* +* Angle between two points on a sphere. +* +* (single precision) +* +* Given: +* A1,B1 r spherical coordinates of one point +* A2,B2 r spherical coordinates of the other point +* +* (The spherical coordinates are [RA,Dec], [Long,Lat] etc, in radians.) +* +* The result is the angle, in radians, between the two points. It +* is always positive. +* +* Called: slDSEP +* +* Last revision: 7 May 2000 +* +* 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 + + REAL A1,B1,A2,B2 + + DOUBLE PRECISION slDSEP + + + +* Use double precision version. + slSEP = REAL(slDSEP(DBLE(A1),DBLE(B1),DBLE(A2),DBLE(B2))) + + END |