What does the image of "moon" in ancient poetry mean?

The moon can be an image used by the author to express sadness. Li Yu once wrote: "When is the spring flower and autumn moon? How much do you know about the past? " ? The small building was easterly again last night, and the old country could not bear to look back on the bright moon "(Yu Meiren). He used this to lament that things are impermanent, like smoke and dreams, and Jinling, the old country that once sang and danced, can only reappear in memory-the so-called impermanence; And the spring flowers and the autumn moon are eternal-the so-called eternity. The beautiful scenery of spring flowers and autumn moon can only set off the sadness that the country is ruined and the king is a prisoner. The moon is eternal, and everything on earth has already changed, from which sadness comes, which is particularly bleak.

Second, express happy and sweet feelings.

The image of "moon" often appears in love poems: first, because of the unique romantic atmosphere of moonlit night, it is especially suitable to set off the tenderness between lovers and outline the lingering feelings between lovers; Second, because the bright and flawless moon can symbolize the constancy and eternity of love. Yan's "Six Commandments" in the sentence "The idle clouds come back, and the moon flowers in the old corner courtyard" explains the location and environment of lovers' tryst and exaggerates the atmosphere of the scene.

Third, express the sadness of parting and missing.

Looking up, I found that it was moonlight, and when I sank back again, I suddenly thought of home. This sentence is a poem that everyone is familiar with. In fact, the moon is one of the things that can remind people of homesickness. Poets of all ages used the moon to express their homesickness. "Su Shi's" Water Tune Song Tou "should be the most open realm. The poet wishes the relatives, friends and lovers around the world who have suffered from parting peace of mind and body and enjoy the moonlight.