When was Ding Younian and what was his life like?

Ding Younian is the first year of the lunar calendar, with a cycle of 60 years, such as 1897, 1957, 20 17 ... all are Ding Younian, and Ding Younian does not refer to a certain year.

Knowing that 20 17 is Ding Younian, we can use 20 17 plus or minus 60 to calculate other Ding Younian. For example, 2077 is also Ding Younian.

There are two simple ways to judge Ding Younian:

Is it the Year of the Rooster? Ding Younian must be the Year of the Rooster, so if it is not the Year of the Rooster, it is definitely not Ding Younian.

② Is it a multiple of 20 17 plus or minus 60? For example, 2005 is the Year of the Rooster, but it is not a multiple of 20 17 plus or minus 60, so it is not Ding Younian.

Extended data Ding Younian is an ancient calendar.

Heavenly stems and earthly branches, the main branch for short, originated from the observation of astronomical phenomena in ancient China. "A, B, C, D, E, Ji, G, Xin, Ren and Gui" are called ten heavenly stems, and "Zi, Ugly, Yin, Mao, Chen, Si, Wu, Wei, Shen, You, Xu and Hai" are called twelve earthly branches.

Heavenly stems and earthly branches constitutes the ancient calendar. Ten branches and twelve branches are matched in turn to form sixty basic units, which cooperate with each other in a fixed order to form the epoch method of branches and branches.

Ding You is the year when the heavenly stems are "Ding" and the earthly branches are "You".