The Astronomical Chapter of "Jin shu" (History of the Jin Dynasty) -- which was also used as a textbook of tenmondo (ancient horoscopy) and rekido (calendrical study) in Japan -- described that 'some of the unusual movement of starts were good omens, but most of them were bad omens of natural disasters.'
律令制下の日本でも天文道・暦道の教科書として用いられていた『晋書』天文志には「天文異変には吉兆もあるが、多くが災異の前兆である」と記されている。