condition mean min max 0 h after light 11.38915 11.1034 11.6749 4 h after light 10.8774 10.8647 10.8901 8 h after light 6.9427 6.68547 7.19993 4 h after dark 9.501825 8.71905 10.2846 8 h after dark 11.4862 10.9184 12.054 12 h after dark 13.16085 11.9574 14.3643