condition mean min max 4 h after light 9.000316 8.815425 9.185207 8 h after light 8.867315999999999 8.133383 9.601249 12 h after light 7.8622285000000005 7.267072 8.457385 4 h after dark 8.4058235 8.175347 8.6363 8 h after dark 8.8321455 8.815425 8.848866 12 h after dark 10.125647 10.125647 10.125647