續一切經音義 6.211

6.211

計都（亦梵語或云鷄兜或云計覩此云蝕伸亦暗曜也案羅睺計都常隱不現遇日月行次即蝕亦名建墜二曜也蝕音食）。

計都 (This is also Sanskrit [Ketu]; it is also written as 鷄兜 or 計覩; here translated as ‘Eclipse Tail’. It is also a dark luminary. Examining it: Rāhu and Ketu are constantly hidden and not manifest; when they encounter the course of the sun and moon, an eclipse occurs. They are also called the two luminaries of rising and descending. Shi is pronounced shi.)