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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def time_at_elevation_utc(self, elevation, direction, date, latitude, longitude, observer_elevation=0):
 """Calculate the time in the UTC timezone when the sun is at the specified elevation on the specified date. Note: This method uses positive elevations for those above the horizon. :param elevation: Elevation in degrees above the horizon to calculate for. :type elevation: float :param direction: Determines whether the calculated time is for the sun rising or setting. Use ``astral.SUN_RISING`` or ``astral.SUN_SETTING``. Default is rising. :type direction: int :param date: Date to calculate for. :type date: :class:`datetime.date` :param latitude: Latitude - Northern latitudes should be positive :type latitude: float :param longitude: Longitude - Eastern longitudes should be positive :type longitude: float :param observer_elevation: Elevation in metres to calculate time at elevation for :type observer_elevation: int :return: The UTC date and time at which the sun is at the required elevation. :rtype: :class:`~datetime.datetime` """


        if elevation > 90.0:
            elevation = 180.0 - elevation
            direction = SUN_SETTING

        depression = 90 - elevation
        try:
            return self._calc_time(depression, direction, date, latitude, longitude, observer_elevation)
        except ValueError as exc:
            if exc.args[0] == "math domain error":
                raise AstralError(
                    ("Sun never reaches an elevation of %d degrees" "at this location.")
                    % elevation
                )
            else:
                raise