condition mean min max 4 h after light 7968.1 7968.1 7968.1 8 h after light 8245.95 7778.5 8713.4 12 h after light 8205.05 8088.1 8322.0 4 h after dark 7403.65 7376.3 7431.0 8 h after dark 7373.25 7255.7 7490.8 12 h after dark 7100.0 7066.9 7133.1