The last sentence of the poem Guazhou refers to the bright moon. Why?

In the early spring of one year, the poet Wang Anshi went from Yangzhou to Guazhou Ferry and anxious to return, hoping to return to his apartment in Zhongshan, Jinling as soon as possible-he has been suspended since the failure of political reform and has lived here ever since. He intends to cross the Yangtze River by boat first, land at Jingkou (now Zhenjiang, Jiangsu) on the other side, and then rush back to Zhongshan overnight.

"Being stopped because of the failure of political reform" is the writing background of this poem. In this case, "the bright moon" symbolizes a wise monarch. This sentence pinned the poet's desire to return to the court and hope to be loyal to the wise monarch.

On the other side is homesickness. Homesickness and bright moon have existed since ancient times.