code: def normalize_sphere(alpha, delta):
      
      v = CartesianVector.from_spherical(r=1.0, alpha=d2r(alpha), delta=d2r(delta))
      angles = v.normalized_angles
      return r2d(angles[0]), r2d(angles[1])
docs: Normalize angles of a point on a sphere.
  
      Parameters
      ----------
      alpha: float
          The alpha (right ascension/longitude like) angle in degrees.
      delta: float
          The delta (declination/latitude like) angle in degrees.
  
      Returns
      -------
      (alpha, delta): (float, float)
          Normalized alpha (degrees) and delta (degrees).
  
      Notes
      -----
  
      This function converts given position on a sphere into the simplest
      normalized values, considering that the points are on a sphere.
  
      Input position        Output position
  
      (180, 91)              (0, 89)
      (180, -91)             (0, -89)
      (0, 91)                (180, 89)
      (0, -91)               (180, -89)
      (120, 280)             (120, -80)
  
      (h2d(25), 45)          (225, 45)
      (h2d(-25), -45)        (345, -45)