condition mean min max 4 h after light 3182.2 3182.2 3182.2 8 h after light 3642.3 3620.4 3664.2 12 h after light 3715.4 3552.4 3878.4 4 h after dark 3185.1 2768.7 3601.5 8 h after dark 3153.9 3073.9 3233.9 12 h after dark 3025.85 2853.7 3198.0