condition mean min max 4 h after light 4.285825 3.61726 4.95439 8 h after light 9.2362 9.2168 9.2556 12 h after light 11.34165 11.0595 11.6238 4 h after dark 13.1441 13.1202 13.168 8 h after dark 7.052375 6.92965 7.1751 12 h after dark 6.342865 5.99996 6.68577