condition mean min max 0 h after light 7.599425 7.34926 7.84959 4 h after light 7.958675 6.44678 9.47057 8 h after light 7.48219 7.4261 7.53828 4 h after dark 10.42325 10.19 10.6565 8 h after dark 10.3946 10.3046 10.4846 12 h after dark 8.151075 7.07394 9.22821