condition mean min max 0 h after light 6.780855 6.09057 7.47114 4 h after light 7.670075 7.10792 8.23223 8 h after light 8.900974999999999 7.71815 10.0838 4 h after dark 8.132755 7.47605 8.78946 8 h after dark 6.943405 6.41935 7.46746 12 h after dark 6.028309999999999 4.85706 7.19956