Astronomical+discoveries+-+China

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 * Detailed records of astronomical observations were kept from about the 6th century BC, until the introduction of Western astronomy and the telescope in the 17th century.
 * Chinese astronomers were able to precisely predict comets and eclipses.
 * They were the first to record a supernova, in the Astrological Annals of the Houhanshu in 185 A.D.
 * Also, the supernova that created the Crab Nebula in 1054 is an example of a "guest star" observed by Chinese astronomers.