condition mean min max 0 h after light 10.7486 10.5295 10.9677 4 h after light 7.93167 7.55948 8.30386 8 h after light 8.02533 7.98744 8.06322 4 h after dark 7.32038 7.23099 7.40977 8 h after dark 7.71904 7.23669 8.20139 12 h after dark 8.7858 8.54553 9.02607