compute_local_frame_on_sphere

compute_local_frame_on_sphere(p_ptg_radec)

Return base of tangent local frame of unit sphere for a given direction with astronomer orientation convention

Parameters:p_ptg_radec (numpy array float) – array ra, dec in radian

:return : 3 3d array : e1, e2, e3 :rtype : 3 3d numpy array