condition mean min max 4 h after light 8.3288555 8.112981 8.54473 8 h after light 9.0006325 8.573861 9.427404 12 h after light 9.09511 8.23448 9.95574 4 h after dark 7.969089 6.71089 9.227288 8 h after dark 8.8912075 8.133636 9.648779 12 h after dark 7.194345 7.194345 7.194345