condition mean min max 4 h after light 5.583005 4.79542 6.37059 8 h after light 5.51544 5.25044 5.78044 12 h after light 8.231595 7.49664 8.96655 4 h after dark 9.81027 9.35714 10.2634 8 h after dark 8.461915 8.02164 8.90219 12 h after dark 7.59179 7.49734 7.68624