condition mean min max 4 h after light 8.654589 8.654295 8.654883 8 h after light 9.1707645 9.122445 9.219084 12 h after light 9.239460000000001 9.188147 9.290773 4 h after dark 8.8428815 8.43811 9.247653 8 h after dark 9.122445 9.122445 9.122445 12 h after dark 7.984463 7.984463 7.984463