code: def _interpret_angle(name, angle_object, angle_float, unit='degrees'):
      
      if angle_object is not None:
          if isinstance(angle_object, Angle):
              return angle_object.radians
      elif angle_float is not None:
          return _unsexagesimalize(angle_float) * _from_degrees
      raise ValueError('you must either provide the {0}= parameter with'
                       ' an Angle argument or supply the {0}_{1}= parameter'
                       ' with a numeric argument'.format(name, unit))
docs: Return an angle in radians from one of two arguments.
  
      It is common for Skyfield routines to accept both an argument like
      `alt` that takes an Angle object as well as an `alt_degrees` that
      can be given a bare float or a sexagesimal tuple.  A pair of such
      arguments can be passed to this routine for interpretation.