condition mean min max 4 h after light 7.921627 7.810193 8.033061 8 h after light 7.974771 7.362031 8.587511 12 h after light 7.685021 7.48398 7.886062 4 h after dark 7.4438195 7.216734 7.670905 8 h after dark 8.545883499999999 7.863676 9.228091 12 h after dark 6.981517 6.981517 6.981517