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58 lines
1.6 KiB
Fortran
58 lines
1.6 KiB
Fortran
SUBROUTINE sla_CS2C (A, B, V)
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*+
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* - - - - -
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* C S 2 C
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* - - - - -
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*
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* Spherical coordinates to direction cosines (single precision)
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*
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* Given:
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* A,B real spherical coordinates in radians
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* (RA,Dec), (long,lat) etc.
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*
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* Returned:
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* V real(3) x,y,z unit vector
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*
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* The spherical coordinates are longitude (+ve anticlockwise looking
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* from the +ve latitude pole) and latitude. The Cartesian coordinates
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* are right handed, with the x axis at zero longitude and latitude, and
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* the z axis at the +ve latitude pole.
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*
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* Last revision: 22 July 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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REAL A,B,V(3)
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REAL COSB
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COSB = COS(B)
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V(1) = COS(A)*COSB
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V(2) = SIN(A)*COSB
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V(3) = SIN(B)
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END
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