condition mean min max 4 h after light 10.77485 10.0769 11.4728 8 h after light 9.85322 9.63654 10.0699 12 h after light 12.53435 11.7401 13.3286 4 h after dark 16.03795 15.8211 16.2548 8 h after dark 15.80395 15.5805 16.0274 12 h after dark 13.80325 12.884 14.7225