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73 lines
1.9 KiB
Fortran
73 lines
1.9 KiB
Fortran
SUBROUTINE sla_CS2C6 ( A, B, R, AD, BD, RD, V )
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*+
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* - - - - - -
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* C S 2 C 6
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* - - - - - -
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*
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* Conversion of position & velocity in spherical coordinates
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* to Cartesian coordinates (single precision)
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*
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* Given:
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* A r longitude (radians)
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* B r latitude (radians)
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* R r radial coordinate
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* AD r longitude derivative (radians per unit time)
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* BD r latitude derivative (radians per unit time)
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* RD r radial derivative
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*
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* Returned:
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* V r(6) Cartesian position & velocity vector
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*
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* Last revision: 11 September 2005
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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, R, AD, BD, RD, V(6)
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REAL SA, CA, SB, CB, RCB, X, Y, RBD, W
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* Useful functions.
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SA = SIN(A)
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CA = COS(A)
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SB = SIN(B)
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CB = COS(B)
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RCB = R*CB
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X = RCB*CA
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Y = RCB*SA
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RBD = R*BD
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W = RBD*SB-CB*RD
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* Position.
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V(1) = X
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V(2) = Y
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V(3) = R*SB
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* Velocity.
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V(4) = -Y*AD-W*CA
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V(5) = X*AD-W*SA
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V(6) = RBD*CB+SB*RD
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END
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