Which country has the earliest observatory in the world?

According to the news released by Guangxi Normal University Press, the country where the earliest observatory was located was ancient Egypt.

As early as 2600 BC, the ancient Egyptians established the earliest observatory in the world to better observe Sirius.

About 2,500 years ago, an observatory was also built in China, which was then called Qing-tai, Mourning-tai and Observatory. In many ancient countries, the observatory was also a place for divination and sacrifice, so the observatory was generally one of the most concerned places for rulers.