condition mean min max 4 h after light 657.8 657.8 657.8 8 h after light 711.25 706.5 716.0 12 h after light 739.35 658.6 820.1 4 h after dark 777.8 735.3 820.3 8 h after dark 970.25 881.6 1058.9 12 h after dark 919.25 859.1 979.4