The modern 24-hour clock has been used since at least the 15th century; About six centuries BC, the Babylonians “in the era of the Second Empire” left a few innovations that are still used today in all countries.

The importance of measuring time by mechanical means was first noticed about 5,500 years ago in ancient Egypt and Sumer, the southern regions of Mesopotamia, where it is now known as the birthplace of modern civilization. The millennial history of making all kinds of sundials and hourglasses led to the spread of knowledge about watches throughout the Mediterranean, and then the Greeks, Romans and Iranians embraced this new tool and each contributed to the development of the industry. . Over the centuries, various tools have been used to measure time. Including candle clocks, lantern clocks, gear clocks, and astronomical clocks, all of which originated in the 15th and 16th centuries. Sundials were made in Egypt around the fourth century BC, and the first was a pyramid-shaped clock invented in 3500 BC. At that time, sundials were very popular. To make it easier to measure time, the Egyptians divided the length of the day into 10 equal parts, and added an additional 4 parts for the time of light shade at sunrise and sunset.