mirror of
https://github.com/eddyem/BTA_lib.git
synced 2025-12-06 02:35:20 +03:00
56 lines
1.5 KiB
Fortran
56 lines
1.5 KiB
Fortran
REAL FUNCTION sla_SEP (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: sla_DSEP
|
|
*
|
|
* 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., 59 Temple Place, Suite 330,
|
|
* Boston, MA 02111-1307 USA
|
|
*
|
|
*-
|
|
|
|
IMPLICIT NONE
|
|
|
|
REAL A1,B1,A2,B2
|
|
|
|
DOUBLE PRECISION sla_DSEP
|
|
|
|
|
|
|
|
* Use double precision version.
|
|
sla_SEP = REAL(sla_DSEP(DBLE(A1),DBLE(B1),DBLE(A2),DBLE(B2)))
|
|
|
|
END
|