condition mean min max 0 h after light 8.78866 8.04312 9.5342 4 h after light 12.0169 11.3792 12.6546 8 h after light 16.6072 15.9626 17.2518 4 h after dark 13.7618 12.2458 15.2778 8 h after dark 14.26635 13.8299 14.7028 12 h after dark 11.7544 10.2731 13.2357