This setting is not natural, but a common result of the wisdom, astronomical observations, and cultural heritage of ancient people.

1、 Source: The Decimal System Selection in Ancient Egypt

1.1 The ancient wisdom of timing by stars

The ancient Egyptians first divided a day into 24 hours. They rely on observing the starry sky to determine time, dividing the night into 12 segments corresponding to 12 iconic stars; During the day, the shadow changes are divided into 12 segments, and the sum of day and night forms a 24-hour prototype.

Why do we prefer 12?

The 12 base system is easier to divide and can be divided by 2, 3, 4, and 6, making it convenient to divide time and allocate labor. It is more practical than the 10 base system, which is also the reason why the 12 hour system has been passed down for thousands of years.

2、 Stereotyping: The Perfection of Ancient Greece and Rome

2.1 Unified timing standards

The ancient Greek astronomer Hippocrates drew inspiration from the Egyptian system and combined it with the twelve signs of the ecliptic to formally establish a uniform division of 24 hours in a day, so that the duration no longer varies with the length of day and night.

2.2 Global Spread of the Roman Empire

The ancient Romans adopted this system, and with the expansion of their empire, オナホ,the 24-hour clock spread throughout Europe, becoming the universal timekeeping system in the West and laying the foundation for future generations.

3、 Inheritance: Civilization heritage that has been used to this day

After the birth of medieval mechanical clocks, the 24-hour clock was solidified as a mechanical design standard; The modern global unified time zone still uses this ancient setting.

From the Egyptian starry sky to modern clocks, 24 hours a day is not a coincidence, but a wise choice made thousands of years ago, already integrated into our daily lives.

Why is a day 24 hours? There is an unexpected history hidden behind it

We have long been accustomed to 24 hours a day, but have you ever thought: why not 10 or 20 hours?