Introduction to the armillary sphere: The armillary sphere is the general name for the armillary sphere and the armillary image in the history of ancient Chinese science and technology. It was invented by the astronomer Luo Xiahong of the Western Han Dynasty and Zhang Heng, the astronomer of the Eastern Han Dynasty. The armillary sphere is an instrument for measuring the spherical coordinates of celestial bodies, while the armillary sphere is an instrument used in ancient times to demonstrate celestial phenomena.