condition mean min max 4 h after light 8.752525 6.61585 10.8892 8 h after light 6.576725 6.52684 6.62661 12 h after light 3.75303 3.62927 3.87679 4 h after dark 10.99155 10.725 11.2581 8 h after dark 9.910375 7.62205 12.1987 12 h after dark 7.762255 7.73865 7.78586