condition mean min max 0 h after light 7.71097 7.37403 8.04791 4 h after light 6.149825 5.99948 6.30017 8 h after light 4.778085 4.66078 4.89539 4 h after dark 7.8233 7.71129 7.93531 8 h after dark 7.37637 7.21319 7.53955 12 h after dark 6.972635 6.37087 7.5744