condition mean min max 4 h after light 11.7316665 11.16423 12.299103 8 h after light 11.753364 11.417736 12.088992 12 h after light 11.7428435 10.893591 12.592096 4 h after dark 14.9452875 14.176292 15.714283 8 h after dark 19.5144125 15.217925 23.8109 12 h after dark 12.088992 12.088992 12.088992