condition mean min max 4 h after light 11.11035 10.7674 11.4533 8 h after light 10.48115 10.4527 10.5096 12 h after light 19.5948 18.2912 20.8984 4 h after dark 21.6784 20.0483 23.3085 8 h after dark 18.4662 18.3886 18.5438 12 h after dark 15.818100000000001 14.8939 16.7423