"Where is the Xuanwei Star Map?" Her voice trembled due to the nanoparticle resonance.
The old man pointed to the base of the armillary sphere: "Back then, Xu Guangqi had the map engraved on the inner side of the equatorial ring of the armillary sphere, using a spectral code that only nano-metal can read."
Before his voice faded, the glazed tiles of the observatory suddenly shattered, and the flames of an Mk153 flamethrower dyed the night sky orange.
Chapter 260