condition mean min max 4 h after light 815.6 815.6 815.6 8 h after light 794.6 776.5 812.7 12 h after light 789.05 721.2 856.9 4 h after dark 930.25 742.6 1117.9 8 h after dark 1050.0 933.1 1166.9 12 h after dark 988.6 977.5 999.7