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diff --git a/math/slalib/doc/dtp2v.hlp b/math/slalib/doc/dtp2v.hlp new file mode 100644 index 00000000..efd928ab --- /dev/null +++ b/math/slalib/doc/dtp2v.hlp @@ -0,0 +1,40 @@ +.help dtp2v Jun99 "Slalib Package" +.nf + + SUBROUTINE slDTPV (XI, ETA, V0, V) + + - - - - - - + D T P V + - - - - - - + + Given the tangent-plane coordinates of a star and the direction + cosines of the tangent point, determine the direction cosines + of the star. + + (double precision) + + Given: + XI,ETA d tangent plane coordinates of star + V0 d(3) direction cosines of tangent point + + Returned: + V d(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 slDTPS. + + 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 |