How many rammed earth columns are there in Dongpogou Observatory?

Through continuous excavation, the palace area in the early and middle period of the site was discovered, and the royal noble tomb in the middle period was also discovered. A large-scale building that may have the function of observing images and timing was found in the middle-term small town sacrifice area, which we called "Dongpogou" Observatory.

There is a three-layer rammed earth structure at the excavation site, which is a semi-circular platform with a diameter of about 50 meters. There is a semicircular observation platform at the top of the pedestal, which is centered on the observation platform and radiates in a fan shape 13 pit from west to east. According to archaeologists, there are 65,438+03 rammed earth columns on this platform. The ancients used the space between the two columns to observe the sunrise in the east of Tal Mountain. According to the light and shadow of the sun, we can infer the solar terms of 12 a year. Compared with the current lunar calendar time and field simulation observation, the seasonal accuracy of solar terms is very high. One of the main functions of rammed soil column joints on the upper platform foundation may be to observe the image and give time, thus guiding farmers to cultivate in time. Judging from the findings at the excavation site, this platform was also used by people at that time to offer sacrifices.