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palDtps2c

Determine RA,Dec of tangent point from coordinates

Description:

From the tangent plane coordinates of a star of known RA,Dec, determine the RA,Dec of the tangent point.

Invocation

palDtps2c( double xi, double eta, double ra, double dec, double raz1, double decz1, double raz2, double decz2, int n);

Arguments

xi = double (Given)
First rectangular coordinate on tangent plane (radians)
eta = double (Given)
Second rectangular coordinate on tangent plane (radians)
ra = double (Given)
RA spherical coordinate of star (radians)
dec = double (Given)
Dec spherical coordinate of star (radians)
raz1 = double (Returned)
RA spherical coordinate of tangent point, solution 1 (radians)
decz1 = double (Returned)
Dec spherical coordinate of tangent point, solution 1 (radians)
raz2 = double (Returned)
RA spherical coordinate of tangent point, solution 2 (radians)
decz2 = double (Returned)
Dec spherical coordinate of tangent point, solution 2 (radians)
n = int (Returned)
number of solutions: 0 = no solutions returned (note 2) 1 = only the first solution is useful (note 3) 2 = both solutions are useful (note 3)

Notes: