Xihe Tower and Wangshu Tower, named after the symbols of the sun and the moon in ancient Chinese mythology, respectively, stand like satellites of the main building.
During the daytime, visitors can observe the sun through the educational adaptive-optics solar telescope in the Xihe Tower and see high-definition images of sunspots and solar flares.
At night, a double-focus, one-meter telescope, the largest one in China in terms of aperture and located in the Wangshu Tower, allows visitors to enjoy views of the moon, planets, and celestial bodies in deep space.