condition mean min max 4 h after light 1056.5 1056.5 1056.5 8 h after light 1157.25 1145.9 1168.6 12 h after light 1242.55 1225.8 1259.3 4 h after dark 1414.6 1374.7 1454.5 8 h after dark 1631.9 1457.0 1806.8 12 h after dark 1341.6 1147.9 1535.3