Why do ancient people like to watch the sky at night?

In ancient China, people thought that the sky was round and the earth was revered. Emperors of past dynasties regarded themselves as the sons of heaven, ruled the country by destiny, and attached great importance to the changes of astronomical phenomena. China is one of the earliest countries in the world to start astronomy. In primitive society, people would observe astronomical phenomena. In the era of Emperor Yao, a civil servant named Tian was set up, specializing in "observing the elephant and choosing the time". Dengfeng Observatory is the oldest existing observatory in China. It was built by Guo Shoujing in 1279 and has a history of more than 700 years. This ancient stargazing platform is about 10 meters high. Under the building, it is big and small, and consists of laurel and high platform. The beam is on a high platform, and the ancients calculated the spring equinox, summer solstice, autumn equinox, winter solstice and other seasons according to the projection length of the beam on the Shi Gui. The rulers of the Yuan Dynasty thought that heaven was supreme and attached great importance to astronomy. After Kublai Khan ascended the throne, he set up a rooftop in Shangdu, moved the capital to the capital, recruited talents, set up a Imperial Academy, and later built stargazing platforms all over the country. The best astronomers in Yuan Dynasty were Wang Xun and Guo Shoujing. They * * * completed the "chronograph calendar", which is only 26 seconds away from the modern calendar. Guo Shoujing has successively created and improved more than ten kinds of astronomical instruments, such as simple instrument, altimeter and inverted instrument.