What does Huang Xuan in perfect international mean in ancient Chinese? And floods?

Heaven and earth are mysterious and yellow, and the first sentence of a thousand words in the universe.

The sky is blue and black, the earth is yellow, and the universe is formed in a state of chaos and ignorance. The sun is oblique to the right, the moon is round, and the stars are all over the boundless space.

Note: Heaven and earth are mysterious and the universe is vast.

The phrase "heaven and earth are mysterious and yellow" comes from the Book of Changes. In the Book of Changes, it is said that "Heaven Xuan Dihuang" is changed to "Heaven and Earth Huang Xuan", and it is rhyme without changing ancient Chinese characters. Yuan Ye's Universe is from Huai Nan Zi and Tai Xuan Jing. Huainanzi said that "the up and down direction is called Yu, and it has been called Zhou since ancient times". Yang Xiong of the Western Han Dynasty wrote Tai Xuan Jing, in which he said "the field of heaven and earth". Together, the two classic words are "the vastness of the universe". This way of quoting classics is called dark quotation, so these two sentences are classics. Literally, these two sentences mean: the color of the sky is black and the color of the earth is yellow. Isn't this a grumbling moan? Can it be passed down as a classic for thousands of years? So what is the meaning of these two sentences? I can only try to understand. Let's follow the article and see where we can experience it. The word "heaven and earth" has multiple meanings in ancient Chinese, including many concepts, among which the land of space, heaven and earth that we are familiar with is just one of them.