condition mean min max 0 h after light 9.0186 8.95482 9.08238 4 h after light 6.856925 6.73586 6.97799 8 h after light 10.27026 9.76612 10.7744 4 h after dark 10.97405 10.1702 11.7779 8 h after dark 10.72121 9.73312 11.7093 12 h after dark 8.532015000000001 7.99263 9.0714