The reason why "Bai Ri" is said to be the sun in the evening is because the image expressed by "Bai Ri" is desolate and tragic, which corresponds to the "Su Yue" in the poem, expressing sorrow with a sad scene.
This statement comes from one of the lines in Tao Yuanming's "Twelve Miscellaneous Poems Part 2" of the Eastern Jin Dynasty: "The sun falls on the West River, and the plain moon rises from the East Ridge." The content of the whole poem is: The sun falls on the West River, and the plain moon rises on the East Ridge. The moon rises over Dongling. The sun is shining thousands of miles away, and the scenery is swinging in the sky. The wind comes and enters the house, and the mat is cold in the night. Qi changes and enlightenment is easy, and sleepless nights will last forever. If you want to make peace with him, you wave your cup to persuade Gu Ying. The sun and the moon throw people away, and there is no ambition. Thinking of this makes me sad and sad, and I can't be still at dawn.
This poem expresses the poet's depression when he has ambitions and is unable to express himself. The tone of the whole poem is pale and silent, so he uses images such as "white sun" and "plain moon" to express his sad emotions.
This poem combines the wonder of the plain moonlight stretching thousands of miles away with the sadness of the sun and moon throwing away people's ambitions and unfulfilled ambitions. The realm of Su Yue Ten Thousand Miles is actually the revelation of Yuan Ming's mind. The sadness of having unfulfilled ambitions is also a state in the soul. Therefore, the entire realm of the poem naturally blends into one realm. The poem covers the ambition of a person with great ambitions, as well as the sense of worry that time has passed but his ambitions have not been achieved and the value of life has not been realized. It also has its significance of cultivating the human soul, inspiring and inspiring the human soul.