Comets (彗星 Huìxīng) have been observed and recorded in China since the Shang Dynasty (1600-1046 BC). The set of comet illustrations shown above is from a silk book (帛书 Bóshū) written during the western Han period. The different shapes and characteristics of the comet tails were outlined and on some of the comets, differences in the appearance of the core of the comet were noted.
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