condition mean min max 4 h after light 8.96423 8.64944 9.130889999999999 8 h after light 8.63658 8.45779 8.76233 12 h after light 8.7963 8.68341 8.87841 4 h after dark 9.03754 8.98 9.07698 8 h after dark 9.21337 9.0771 9.34477 12 h after dark 9.490026666666667 9.3821 9.56935