This wood-block printed book from 1633, an expansion of one printed in 1461, illustrates Chinese theories of early astronomy in the Tang (618-907) and Song (960-1279) dynasties, when there was great interest in celestial phenomena. The armillary sphere shown indicates the motions of the sun and moon, as well as the stars and constellations. Also, the four seasons are arranged in order according to their progressions and retrogradations.


