Calculate sunrise times for locations.

        Args:
            date (datetime.date): Calculate rise or set for given date
            zenith (str): Calculate sunrise events, or end of twilight
        Returns:
            list of list of datetime.datetime: The time for the sunrise for
                each point in each segment

def sunrise(self, date=None, zenith=None):
        """Calculate sunrise times for locations.

        Args:
            date (datetime.date): Calculate rise or set for given date
            zenith (str): Calculate sunrise events, or end of twilight
        Returns:
            list of list of datetime.datetime: The time for the sunrise for
                each point in each segment
        """
        return (segment.sunrise(date, zenith) for segment in self)