condition mean min max 0 h after light 7.41332 6.98138 7.84526 4 h after light 9.63909 9.4022 9.87598 8 h after light 7.39634 7.04482 7.74786 4 h after dark 8.1247 8.10868 8.14072 8 h after dark 8.737415 8.37053 9.1043 12 h after dark 9.593215 9.57893 9.6075