def radiation_values(self, location, timestep=<NUM_LIT:1>):
<EOL>sp = Sunpath.from_location(location)<EOL>altitudes = []<EOL>dates = self._get_datetimes(timestep)<EOL>for t_date in dates:<EOL><INDENT>sun = sp.calculate_sun_from_date_time(t_date)<EOL>altitudes.append(sun.altitude)<EOL><DEDENT>dir_norm, diff_horiz = ashrae_revised_clear_sky(<EOL>altitudes, self._tau_b, self._tau_d)<EOL>glob_horiz = [dhr + dnr * math.sin(math.radians(alt)) for<EOL>alt, dnr, dhr in zip(altitudes, dir_norm, diff_horiz)]<EOL>return dir_norm, diff_horiz, glob_horiz<EOL>
Lists of driect normal, diffuse horiz, and global horiz rad at each timestep.