healpy.rotator.angdist¶
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healpy.rotator.
angdist
(dir1, dir2, lonlat=False)¶ Returns the angular distance between dir1 and dir2.
Parameters: dir1, dir2 : float, array-like
The directions between which computing the angular distance. Angular if len(dir) == 2 or vector if len(dir) == 3. See lonlat for unit
lonlat : bool, scalar or sequence
If True, angles are assumed to be longitude and latitude in degree, otherwise they are interpreted as colatitude and longitude in radian. If a sequence, lonlat[0] applies to dir1 and lonlat[1] applies to dir2.
Returns: angles : float, scalar or array-like
The angle(s) between dir1 and dir2 in radian.
Examples
>>> import healpy as hp >>> hp.rotator.angdist([.2,0], [.2, 1e-6]) array([ 1.98669331e-07])