condition mean min max 4 h after light 555.7 555.7 555.7 8 h after light 605.7 548.9 662.5 12 h after light 688.5 618.1 758.9 4 h after dark 754.9 713.4 796.4 8 h after dark 1049.5 902.6 1196.4 12 h after dark 1012.6 857.8 1167.4