How did ancient people know the time when they had watches?

In ancient China, astronomy was a particularly developed and advanced country in the world, so we first calculated the relationship between the sun, the moon and the earth, determined the sundial (its needle length, shape and many details need to be accurately calculated), and calculated the division of the day, hour, hour, minute, four seasons and twelve solar terms through projection, which is a unique calendar in the world. Therefore, China's calendar is difficult to calculate with high accuracy, and few people know it. Specifically, there are water leaks, hourglasses, early bells and drums to tell the emperor and the people the time, and to determine the relatively accurate time, so there is a career of playing. Some people also light incense to keep time. How long can ordinary incense last, as long as it is lit continuously. This method is lower than the copper pot dripping timing level, and the error is slightly larger, so it is generally used for coarse timing in families.

The emperor of the Northern Song Dynasty had a "chime" in the imperial court, and every time the villain came out to beat the drum, the number was hours; Every once in a while (every fifteen minutes), another group of little people come out. Part of this clock is made of wood, which was burned by the Yuan Army. After the Ming dynasty, there was a mechanical clock, and the daily error was generally within a few minutes.

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