condition mean min max 4 h after light 7.986795 7.586264 8.387326 8 h after light 8.387326 8.387326 8.387326 12 h after light 9.0875715 8.275071 9.900072 4 h after dark 7.889972 7.787188 7.992756 8 h after dark 9.0458165 8.139105 9.952528 12 h after dark 7.250971 7.250971 7.250971