How many years is one epoch?

One jiazi is 12 years, the age star or taiyou ji, 12 years for a cycle, called a jiazi.

One ji is 60 years, and Dongfang Shuo's 3,000 ji indicates that he was 180,000 years old.

Expanded:

p>The unit of time in ancient China:

Nowadays it is 24 hours per day and night, while in ancient times it was 12 hours. When western mechanical clocks and watches were introduced to China, people called the Chinese and western time units 'big hour' and "hour" respectively. With the popularization of clocks and watches, people gradually forgot about the 'big hour', while the 'hour' has been used until now.

In ancient times, instead of counting by one, two, three, four, we used zi jiao cin dao as a symbol. Animals such as rats, cows, tigers and rabbits were also used as alternatives to make it easy to remember.

Ancient Chinese Timekeeping Tools:

In ancient times, there were two kinds of timekeeping tools, one was a sundial and the other was a leak.

The sundial was timed by the movement of the sun's shadow, corresponding to the scale on the surface of the sundial. We should be able to see it in the Palace Museum and the Beijing Observatory. The funnel is caused by dripping water, and it consists of four copper pots used to hold water, overlapping from top to bottom. There are three holes at the top and an arrow-shaped buoy at the bottom. The water level rises as it drips, and the pots have a scale on them so it keeps time.

The original day and night were divided into 100 minutes because it could not be divided into 12 hours, then changed to 96, 108, 120 minutes, and by the Qing Dynasty was officially set at 96 minutes; thus, one hour equaled eight minutes. A moment is divided into three parts, totaling **** 24 minutes, and 24 seasons. Note that a minute is not now a minute, but the word, which is inscribed between two moments with two strange symbols, hence it is called a word.

References:

Ji (Ancient Calendar Term) -... -Baidu Encyclopedia

Units of time - Baidu Encyclopedia