condition mean min max 4 h after light 547.6 547.6 547.6 8 h after light 684.8 675.7 693.9 12 h after light 734.55 699.8 769.3 4 h after dark 1074.0 989.7 1158.3 8 h after dark 1222.85 1129.4 1316.3 12 h after dark 1060.05 956.4 1163.7