condition mean min max 4 h after light 6.6418 5.5915 7.6921 8 h after light 7.94472 7.69566 8.19378 12 h after light 10.7747 10.6305 10.9189 4 h after dark 13.5241 13.2684 13.7798 8 h after dark 9.893844999999999 9.62819 10.1595 12 h after dark 10.0828 9.7277 10.4379