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.help s2tp Jun99 "Slalib Package"
.nf
SUBROUTINE slS2TP (RA, DEC, RAZ, DECZ, XI, ETA, J)
- - - - -
S 2 T P
- - - - -
Projection of spherical coordinates onto tangent plane:
"gnomonic" projection - "standard coordinates"
(single precision)
Given:
RA,DEC real spherical coordinates of point to be projected
RAZ,DECZ real spherical coordinates of tangent point
Returned:
XI,ETA real rectangular coordinates on tangent plane
J int status: 0 = OK, star on tangent plane
1 = error, star too far from axis
2 = error, antistar on tangent plane
3 = error, antistar too far from axis
P.T.Wallace Starlink 18 July 1996
Copyright (C) 1996 Rutherford Appleton Laboratory
Copyright (C) 1995 Association of Universities for Research in Astronomy Inc.
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