condition mean min max 4 h after light 957.4 957.4 957.4 8 h after light 948.6 817.8 1079.4 12 h after light 898.75 871.1 926.4 4 h after dark 827.2 820.9 833.5 8 h after dark 593.7 580.2 607.2 12 h after dark 566.05 512.7 619.4