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.help dcs2c Jun99 "Slalib Package"
.nf
SUBROUTINE slDS2C (A, B, V)
- - - - - -
D S 2 C
- - - - - -
Spherical coordinates to direction cosines (double precision)
Given:
A,B dp spherical coordinates in radians
(RA,Dec), (Long,Lat) etc
Returned:
V dp(3) x,y,z unit vector
The spherical coordinates are longitude (+ve anticlockwise
looking from the +ve latitude pole) and latitude. The
Cartesian coordinates are right handed, with the x axis
at zero longitude and latitude, and the z axis at the
+ve latitude pole.
P.T.Wallace Starlink October 1984
Copyright (C) 1995 Rutherford Appleton Laboratory
Copyright (C) 1995 Association of Universities for Research in Astronomy Inc.
.fi
.endhelp
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