《汉书·志·五行志下之下》
武帝征和四年二月丁酉，有两块陨石坠于雍地，天青色，没有云，声音在方圆四百里内都听得见。
武帝征和四年二月丁酉，陨石雍，二，天晏亡云，声闻四百里。
On February Dingyou in the fourth year of Emperor Wu's Zhenghe reign, two meteorites fell on the land of Yong. The sky was blue and there were no clouds. The sound could be heard from 400 miles around.