What is the allusion to going straight to the Milky Way?

Cowherd and Weaver Girl meet in the Milky Way. The word "going straight to the Milky Way" comes from China's ancient poems, such as the poem "going straight to the Milky Way to the home of Petunia and Weaver Girl" in Song of the King of Qin by the Tang Dynasty poet Li He. In ancient legends, the Yellow River is connected with the Milky Way in the sky. According to Jingchu Chunqiu, Emperor Wu of the Han Dynasty sent Zhang Qian to summer to find the source of the Yellow River. After walking for more than a month, Zhang Qian finally met the Weaver Girl. The Weaver Girl gave Zhang Qian a machine stone. Later, in the same book, it was recorded that the Weaver Girl was the granddaughter of the Emperor of Heaven and tapestry for many years. Since I married the cowherd, I have interrupted the brocade. The Emperor was furious and ordered her and Cowherd to live on both sides of the Milky Way across the river and meet once a year on the night of the seventh day of July. So the word "Straight into the Milky Way" actually means that the Cowherd and the Weaver Girl meet in the Milky Way.