Insect solar terms

Although the Tang Dynasty was advanced in the world, it was still ancient, and the algorithm of time was not accurate. People are controversial about how many hours a day, but no one thinks that a day is 96 hours. The Dayan calendar method in the Tang Dynasty said that an extra day is called one hundred minutes, and one minute is ten minutes, which is a bit inconvenient. But one minute is five minutes, another day is sixty minutes, and the other day is divided into two halves, and half is equal to one hour and two and a half today. However, although this system is an integer, there are more than 506 points and more than 10 1 minute, which are not integers. However, the opening sundial has divided half an hour, that is, one hour, into four quarters.