condition mean min max 4 h after light 3488.505 3460.99 3516.02 8 h after light 3814.815 3802.54 3827.09 12 h after light 3251.64 3200.12 3303.16 4 h after dark 3126.7666666666664 2928.16 3327.71 8 h after dark 2828.7566666666667 2723.27 2915.71 12 h after dark 3389.38 3367.82 3415.58