This poem is from on the mountain holiday thinking of my brothers in shandong written by the Tang Dynasty poet Wang Wei. The Double Ninth Festival is a traditional festival in China. It is celebrated on the ninth day of the ninth lunar month every year. This festival has many customs, such as climbing mountains, enjoying chrysanthemums, drinking chrysanthemum wine, inserting dogwood and eating double ninth cake, and gradually adds the connotation of respecting the elderly. Now it is often called "Old People's Day".
The poem expresses the poet's deep yearning for his hometown and relatives during the Double Ninth Festival when he is in a foreign land.