condition mean min max 4 h after light 9.7820585 9.435036 10.129081 8 h after light 9.4384495 9.321232 9.555667 12 h after light 8.930288000000001 8.286231 9.574345 4 h after dark 8.845546 8.286231 9.404861 8 h after dark 9.8769445 9.404861 10.349028 12 h after dark 9.832601 9.832601 9.832601