palDs2tp
palDs2tp
- Spherical to tangent plane projection
- Description:
- Projection of spherical coordinates onto tangent plane:
"gnomonic" projection - "standard coordinates"
- Invocation:
- palDs2tp( double ra, double dec, double raz, double decz,
double
xi, double
eta, int
j );
- Arguments:
-
-
ra = double (Given)
-
RA spherical coordinate of point to be projected (radians)
-
dec = double (Given)
-
Dec spherical coordinate of point to be projected (radians)
-
raz = double (Given)
-
RA spherical coordinate of tangent point (radians)
-
decz = double (Given)
-
Dec spherical coordinate of tangent point (radians)
-
xi = double
(Returned)
-
First rectangular coordinate on tangent plane (radians)
-
eta = double
(Returned)
-
Second rectangular coordinate on tangent plane (radians)
-
j = int
(Returned)
-
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