《南齐书·志·卷十一》
《赤帝歌》龙精初次出现于心宿中，阳光北射土圭与曰影长度相等。
《赤帝歌》：龙精初见大火中，朱光北至圭景同。
Dragon Claw Star first appears among Heart Mansion in the song of Red Emperor, as the sunlight casts directly onto the earthwatch at the time when days and nights are of equal length.