condition mean min max 4 h after light 7.99973 7.64524 8.35422 8 h after light 8.73578 8.7032 8.76836 12 h after light 10.68965 10.6063 10.773 4 h after dark 15.01005 14.3544 15.6657 8 h after dark 14.825050000000001 14.6342 15.0159 12 h after dark 12.59985 12.4813 12.7184