condition mean min max 4 h after light 1132.5 1132.5 1132.5 8 h after light 1033.25 921.1 1145.4 12 h after light 1067.1 966.4 1167.8 4 h after dark 984.55 983.5 985.6 8 h after dark 1045.6 853.9 1237.3 12 h after dark 1049.15 1034.6 1063.7