《资治通鉴·陈纪·陈纪七》
秋季七月，北周国主到太庙祭祀；丙午，到圜丘祭天。
秋，七月，周主享太庙；丙午，祀圜丘。
In the seventh month of autumn, the King of the Northern Zhou Dynasty went to the Imperial Ancestral Temple to worship; on Bingwu, he worshipped heaven at the Circular Mound.