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.help tp2v Jun99 "Slalib Package"
.nf
SUBROUTINE slTP2V (XI, ETA, V0, V)
- - - - -
T P 2 V
- - - - -
Given the tangent-plane coordinates of a star and the direction
cosines of the tangent point, determine the direction cosines
of the star.
(single precision)
Given:
XI,ETA r tangent plane coordinates of star
V0 r(3) direction cosines of tangent point
Returned:
V r(3) direction cosines of star
Notes:
1 If vector V0 is not of unit length, the returned vector V will
be wrong.
2 If vector V0 points at a pole, the returned vector V will be
based on the arbitrary assumption that the RA of the tangent
point is zero.
3 This routine is the Cartesian equivalent of the routine slTP2S.
P.T.Wallace Starlink 11 February 1995
Copyright (C) 1995 Rutherford Appleton Laboratory
Copyright (C) 1995 Association of Universities for Research in Astronomy Inc.
.fi
.endhelp
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