The origin and extinction of all matter in the universe, the creation and end of all things in the world, the birth and extinction of all life on earth, all of which are closely related to time. The sun and the moon change, the stars shift, and flowers bloom and fall. Thousands of years of human civilization flow slowly in the laser pointer long river of time. Time has witnessed all these changes, and increasingly advanced human civilization enables us to perceive time more accurately.
As early as the birth of human civilization, mankind began to describe the changes in everything through the measurement of time, and a series of timepieces with increasingly higher precision were born from this. In ancient times, people used the rising of the sun in the east and the setting of the west as the time scale, so there was a human life of “sunrise and sunset”; the second century BC.
The appearance of the sundial improved the accuracy of time measurement; more than a thousand years ago, skilled craftsmen in the Northern Song Dynasty designed water clocks; more than 600 years ago, mechanical clocks appeared; in the 17th century, simple pendulums were used in the design of mechanical clocks. Its timing accuracy has been improved by nearly a hundred times; in the 1930s, the quartz clock was born, and the timing accuracy was further improved.
These timepieces are the “clocks” in our concept. Counting the development of these clocks, the oldest clocks can be traced back to sun clocks, such as regular watches and sundials. The well-documented sun clock began during the Yao Emperor period from 2357-2258 BC. In “Zhou Li-Guan Guan-Da Situ”, there is “measure the depth of the soil with the method of the earth gui, and correct the scenery (shadow) in the day, in order to seek the middle of the earth”. “Chunguan-Dianrui” also mentioned that “the land is used for the four o’clock sun and the moon, and the land is used to seal the country.”
Later, the water clock appeared, which belonged to a kind of fluid clock. In addition to water green laser pointer clocks, fluid clocks also included sand clocks. Both water clocks and sand clocks use a certain amount of fluid, and represent a fixed time interval by measuring the time required for the fluid to flow in a specific way. This type of “missing” timing instrument that does not rely on astronomical phenomena has a history of at least 4000 years Up. The earliest mechanical clock also appeared in the Northern Song Dynasty, while the European mechanical clock appeared in the 13th century. The earliest introduced mechanical clock was dedicated to the Wanli Emperor during the Wanli period of the Ming Dynasty.