condition mean min max 4 h after light 45.9281 43.8826 47.9736 8 h after light 22.5053 22.2965 22.7141 12 h after light 15.73765 14.8174 16.6579 4 h after dark 16.96065 16.6144 17.3069 8 h after dark 23.5029 22.5877 24.4181 12 h after dark 31.1426 30.2515 32.0337