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)
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