condition mean min max 4 h after light 511.7 511.7 511.7 8 h after light 669.9 578.9 760.9 12 h after light 807.45 698.5 916.4 4 h after dark 627.35 518.5 736.2 8 h after dark 566.25 307.5 825.0 12 h after dark 410.85 369.1 452.6