condition mean min max 4 h after light 861.5835 846.698 876.469 8 h after light 754.4635 734.199 774.728 12 h after light 714.596 654.779 774.413 4 h after dark 962.546 927.593 997.499 8 h after dark 1172.205 1144.31 1200.1 12 h after dark 1087.7385 968.627 1206.85