Introduction to Star Observation Pavilion: The private observatory built by Tang Gong is the only building of its kind currently seen in our country. The lower floor is a library and a small living room, and the upper floor is a cylindrical observatory structure. The vaulted ceiling on the second floor marks the constellations of Orion, Beidou, and the Seven Constellations (destroyed). The rooftop is in the shape of a garden, with an average of six battlement-shaped brick columns connected to six circular zinc tubes. The zinc tubes are connected by a red vertical line. It is said that it is convenient for people to use a sextant to observe celestial bodies according to 180 degrees of east and west longitude.