condition mean min max 4 h after light 9.1904115 9.138912 9.241911 8 h after light 8.902014999999999 8.665118 9.138912 12 h after light 9.046267499999999 8.953623 9.138912 4 h after dark 9.135697 8.037623 10.233771 8 h after dark 9.0867325 8.532384 9.641081 12 h after dark 8.99849 8.99849 8.99849