What is the reason why Mr. Fujino mentioned the names Sun Tomb and Land and Water?

Twilight reminds people of "but I look at home, and twilight is getting dark", expressing the author's thoughts about family and relatives.

"Mito" is the place where Zhu Shunshui, a scholar with solar terms, died, expressing the author's admiration. At the same time, it also reveals the author's worries about the future of the country and the people.

Did I answer more completely?