vec2ang

Routine to convert the 3D position vector $(x,y,z)$ of point into its position angles $(\theta,\phi)$ on the sphere with $x = \sin\theta\cos\phi$, $y=\sin\theta\sin\phi$, $z=\cos\theta$.

Location in HEALPix directory tree: src/f90/mod/pix_tools.F90 

FORMAT

call vec2ang( vector, theta, phi )

ARGUMENTS

name&dimensionality	kind	in/out	description
vector(3)	DP	IN	three dimensional cartesian position vector $(x,y,z)$. The north pole is $(0,0,1)$
theta	DP	OUT	colatitude in radians measured southward from north pole (in [0,$\pi$]).
phi	DP	OUT	longitude in radians measured eastward (in [0, $2\pi$]).

RELATED ROUTINES

This section lists the routines related to vec2ang

ang2vec

converts the position angles of a point on the sphere into its 3D position vector.

angdist

computes the angular distance between 2 vectors

vect_prod

computes the vector product between two 3D vectors