The so-called lunar calendar year, that is, trunks and branches are literally equivalent to trunks and branches.
In ancient times, the sky was dominant and the earth was subordinate. The connection between heaven and stem is called heavenly stem, and the connection between earth and branch is called earthly branch. Together, it is called heavenly stems and earthly branches, or "dry branch" for short.
Gong Zizhen's Jihai Miscellaneous Poems got its name because it was written in Jihai in the 19th year of Daoguang in Qing Dynasty (1839).
This year, the author was 48 years old. He resigned from Beijing and returned to Hangzhou because he hated his official career. Later, he came back to see his family.
On the way to and from the north and south, he looked at the great rivers and mountains of the motherland and witnessed the people living in dire straits. He couldn't help being moved by what he saw, and his thoughts were full. He improvised one poem after another, so he gave birth to Jihai Miscellaneous Poems.
Among them, the fifth "Jihai Miscellaneous Poems" and the fifth 125 "Jihai Miscellaneous Poems" were angry with Kyushu, and they were selected into multiple versions of Chinese textbooks for primary and secondary schools nationwide by storm.