condition mean min max 4 h after light 518.3 518.3 518.3 8 h after light 581.35 555.5 607.2 12 h after light 743.7 636.5 850.9 4 h after dark 906.75 888.6 924.9 8 h after dark 1198.65 1050.6 1346.7 12 h after dark 1022.3 873.3 1171.3