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.
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