Qianlong, Emperor Aisingiorro Hongli of the Qing Dynasty (171September 25th, 2008-1February 7th, 799), was the sixth emperor of the Qing Dynasty and the fourth emperor after Beijing made its capital.

The year number "Qianlong" means "Heaven prospers". After 60 years in office, he continued to talk about politics and actually exercised supreme power for 63 years and 4 months. He is the longest-serving and longest-lived emperor in the history of China.

Used to arrange years and dates in the summer calendar.

Heavenly stems and earthly branches, the main branch for short, originated from the observation of astronomical phenomena in ancient China.

Ten cadres refer to meeting, understanding, softness, strength, harmony, slaughter, chapter, weight, metaphysics and yang.

Twelve branches refer to those who are trapped, enthusiastic, nurturing, single-handed, promising, wilderness, escaping, thanking, wading in the beach, having difficulties, being alone, and being extremely deep.

Simplified heavenly stems and earthly branches: "A, B, C, D, E, Ji, G, Xin, Ren, Gui" is called ten heavenly stems, and "Zi, Ugly, Yin, Mao, Chen, Si, Wu, Wei, Shen, You, Xu, Hai" is called twelve earthly branches.

Ten heavenly stems and twelve earthly branches are collocated in turn to form sixty basic units, and they cooperate with each other in a fixed order to form the chronology of the stems and branches. Heavenly stems and earthly branches's invention has far-reaching influence, and he still uses heavenly stems and earthly branches in calendar, tricks, calculation, naming and so on.