"Why do the stars slant down from the clearing" and "The moon runs up from the river", two poems describing the scenery, have always been

These two poems describing scenery have always been praised by people. The endless starry sky, the endless Yuan Ye, the endless moonlight and the endless river look so vast and spacious that people are relaxed and happy. No wonder some people think that these two poems are "broad-minded" (reading Pu Qilong's Du Xinjie), and some even think that they write the author's feelings of "happiness" (see "Interpretation of Du Fu's Five Laws" in Selected Poems of Tang Dynasty). In fact, as long as the writing background of this poem is related to the artistic conception of the whole poem, it is not difficult to see that both poems are written in a happy scene, and the author compares the loneliness and smallness of a poor boat with the vastness of nature. Facing the vast universe, thinking about the bumpy past and looking forward to the bleak future, where is his return journey, how can he not feel sad from it?