The difference between the original calendar and the chronograph calendar

There are obvious differences in calculation methods, use history and application scope.

According to the fortune-telling website, taichu calendar and Chronograph are two ancient calendars in China, and both of them determine the time through ephemeris observation. However, there are obvious differences in their calculation methods, use history and application scope.

Taichu calendar is a calendar made during the period of Emperor Wu of the Han Dynasty, and it is generally believed that it was put into use in BC 104. Its main feature is that the first year of Taichu is taken as the starting point of chronology, and the time nodes such as Wang Shuo and solar terms are confirmed by combining ancient customs and temperament. This calendar is the earliest calendar based on the sun in domestic history, and it began to be widely used in Sui and Tang Dynasties.

Chronological calendar is a calendar made by Li in Tang Dynasty, which was put into use in 7 13. It mainly uses the position change of the constant star to determine the time. Before the invention of the telescope, it was a more accurate calendar. The design idea is to use a fixed star on the celestial sphere as a reference point, and then use the longitude and latitude of the yellow meridian and other parameters to accurately record the change of the star position, so as to calculate the time.

Chronological calendar is more accurate than taichu calendar method in calendar, but it has not been widely used because of its high computational complexity and limited application scope. In contrast, although taichu calendar method has some accuracy problems, its overall design is more concise and its calculation is more convenient, so it was popular at that time and successfully applied to actual production and life.

Although taichu calendar and Chronograph are both important representatives of ancient calendars in China, they are quite different in application. Taichu calendar method is mainly used in daily life, while calendar is more used in scientific experiments and astronomical observation. However, the creation and application of these two calendars reflect the efforts and wisdom of the ancients in measuring time and the sun, which has very important historical and cultural value.