palDtp2s palDtp2s - Tangent plane to spherical coordinates

Description:
Transform tangent plane coordinates into spherical.

Invocation:
palDtp2s( double xi, double eta, double raz, double decz, double $*$ra, double $*$dec);

Arguments:

xi = double (Given)
First rectangular coordinate on tangent plane (radians)
eta = double (Given)
Second rectangular coordinate on tangent plane (radians)
raz = double (Given)
RA spherical coordinate of tangent point (radians)
decz = double (Given)
Dec spherical coordinate of tangent point (radians)
ra = double $*$ (Returned)
RA spherical coordinate of point to be projected (radians)
dec = double $*$ (Returned)
Dec spherical coordinate of point to be projected (radians)