Why Cheomseongdae is an astronomical observatory

 Some people argue that Cheomseongdae is not an astronomical observatory because it is small (both simple and shabby) or because it is too small to use because it has subjective value in the word. 1.You can't because it's too small? There are many people who say that Cheomseongdae is not an astronomical observation device because it is small.However, it is only a modern view that size is important for astronomical observation.What did astronomical observation do in ancient times?This simple question alone shows that the size of Cheomseongdae is not important for astronomical observation.It can be seen that there is no advantage of being large in the absence of development of astronomical observation instruments.One or two people is enough anyway.Also, Gwancheondae Pavilion in the Joseon Dynasty is only 4.2 meters high, 2.8 meters wide, and 25 meters long. 2.Why low? If you think about the ancient sky, you'll get the answer.It doesn't make much difference between what you see in the plains in ancient times and what you see in the mountains in modern times.In ancient times, when there was little air pollution, we didn't have to go up to the mountain and observe the astronomical observations and report back down, and considering the story of Comet Kim Yu-shin, it was natural to build astronomical phenomena not far from the palace. 3.Isn't it simply a place for azimuth measurement or ancestral rites? Gwancheondae was also called Cheomseongdae in the Joseon Dynasty, and the word Cheomseongdae itself means looking at the stars.It's kind of weird to say it's a ritual building for azimuth measurement or ancestral rites.Of course, I don't know if Cheomseongdae is just a muted one.In addition, in the Spring and Autumn Equinox, sunlight is supposed to shine to the bottom of Cheomseongdae, and in the summer solstice and winter solstice, the rays completely disappear from the bottom, measuring the branches and points of spring and autumn.It even acted as a kind of sundial. In conclusion, Cheomseongdae was not such a strange building.Considering that the size is observable, etymology, and the importance of astronomy, it is appropriate and it even served as a sundial, so it seems reasonable that it is a star observation device rather than a simple ritual or azimuth measurement.