condition mean min max 4 h after light 1198.73 1173.42 1224.04 8 h after light 1387.565 1369.95 1405.18 12 h after light 1321.22 1281.4 1361.04 4 h after dark 897.973 830.516 965.43 8 h after dark 1021.435 1018.57 1024.3 12 h after dark 1097.62 1076.37 1118.87