condition mean min max 4 h after light 8.08029 7.70055 8.46003 8 h after light 9.28153 9.25274 9.31032 12 h after light 9.534805 9.04991 10.0197 4 h after dark 15.62865 15.0377 16.2196 8 h after dark 13.01315 12.7471 13.2792 12 h after dark 11.29265 11.2721 11.3132