Why is 1 day 24 hours? Could you tell me the origin of 12?

12 system came into being later than decimal system, and 12 system came into being from human observation of astronomical phenomena. With the development of human beings, they are not satisfied with their own understanding, but observe the phenomena in nature. Climate change is a great change in nature. In order to understand the laws of climate change, people observe astronomical phenomena. The most obvious phenomenon in the sky is the relationship between the change of the sun and the moon, the cold and warm weather and the growth cycle of plants. So I know the date, month and year. Then I learned that the moon has 12 gains and losses a year. Therefore, by comparing one year with 12 months, the original 12 system is obtained.

We should see that the generation of 12 is related to the time of human cognition. Therefore, it is not difficult for us to understand that when calculating time, people regard the astronomical phenomena of 1 year as 12 months and 12 years as a cycle, so they divide a day into 12 parts, which is the time in China. The resulting 12 system.

From people's understanding of 1 year 12 months later, people know that January is almost thirty days. So a year is 360 days. 360 days, time cycle once, forming a big "circle". So according to the fact that the week of a year is 360 days and the circumference is set to 360 degrees, because there are 90 days in each quarter, a rectangular coordinate system is established at the central angle, and each quadrant is also 90 degrees. There may also be some relations here. The rectangular coordinate system in the west was established late, but the moments used by ancient carpenters were all right angles. And rules can draw circles. >

If 360 days is obviously too big to be used as a decimal system, later generations took a middle number as a decimal system according to the relationship between 360 days and 12 months. This is 60. 60 also comes from time and circle, so it also applies to time, one hour and 60 minutes. 60 bills a minute.

In addition to the above, there are hexadecimal and other kinds. The month of the lunar calendar is 36.

Binary, I think it may have something to do with people having five fingers in one hand. There is another possibility that hexadecimal is generated.

Combination of 5 groups and 12 groups.

The chronology of China is based on the speed of the least common multiple of the trunk and branch, that is, 60 years, which is composed of 10 and 12.