What exactly do a, b, c, d, e, g, n, n and g mean?

It's ten days of dryness again, and the word dryness comes from the ancient people's summary of the laws of all things, as follows:

First, everything is born (Born)

all things grow

Everything is natural (wonderful)

Ding, everything is strong.

Everything is thriving (thriving)

Everything has its own music (bending)

Geng, everything is replaced by Geng.

Xin, everything is difficult (difficult)

Ren, everything is very heavy.

Everything dies.

Chronology of cadres and branches

The chronology of trunk and branch consists of 60 chronologies (see the table in the sequence table above for details) (or see the five elements and genera below), and so on, with 60 years as a cycle.

The first year of a cycle of the trunk and branch chronology is "Jiazi", the second year is "Ugly B", and so on, the cycle is 60 years; After a period, it will be used repeatedly. (60 is the least common multiple of 10 and 12, so every 60 years is a period).

For example, 1644 may be the year of Shen Jia, 60 years later, 1704 is also the year of Shen Jia, and 300 years later, 1944 is still the year of Shen Jia. Note that the above is only approximate correspondence, because the Gregorian calendar and the trunk calendar are different calendars, and the starting point of a year is different.

Refer to the above contents: Baidu Encyclopedia-heavenly stems and earthly branches, Baidu Encyclopedia-Tiangan.