《旧唐书·本纪·卷十七》
二十七日，彗星长一丈多，笔直向西行，渐渐向南指。二十八日夜，彗星长二丈多，广三尺，在女九度方位，从此渐渐长而阔。
辛酉夜，彗长丈余，直西行，稍南指，在虚九度半。壬戌夜，彗长二丈余，广三尺，在女九度，自是渐长阔。
February 27th, the comet was over ten feet long, traveling straight west, gradually pointing South. On the night of February 28th, the comet was over twenty feet long, three feet wide, at the ninth latitude of female. From there it gradually grew longer and wider.