docs: def sunset(self, date=None, zenith=None):
          """Calculate sunset times for locations.
  
          Args:
              date (datetime.date): Calculate rise or set for given date
              zenith (str): Calculate sunset events, or start of twilight times
  
          Returns:
              list of list of datetime.datetime: The time for the sunset for each
                  point in each segment
          """
          return (segment.sunset(date, zenith) for segment in self)