healpy.rotator.Rotator.angle_ref¶
-
Rotator.
angle_ref
(*args, **kwds)¶ Compute the angle between transverse reference direction of initial and final frames
For example, if angle of polarisation is psi in initial frame, it will be psi+angle_ref in final frame.
Parameters: dir_or_vec : array
Direction or vector (see Rotator.__call__)
lonlat: bool, optional
If True, assume input is longitude,latitude in degrees. Otherwise, theta,phi in radian. Default: False
inv : bool, optional
If True, use the inverse transforms. Default: False
Returns: angle : float, scalar or array
Angle in radian (a scalar or an array if input is a sequence of direction/vector)