佛祖歷代通載 1.187

1.187

（五）　諸星宿者。空居天宮諸寶所成。其形皆圓。小一牛吼。中三牛吼。大六牛吼。周圍三倍。係四王眾。

(5) The stars and constellations are formed from various jewels belonging to the celestial palaces of the sky-dwelling gods. Their forms are all spherical. The smallest is one cow-call (goruta); the medium is three cow-calls; the largest is six cow-calls. Their circumferences are threefold. They belong to the retinue of the Four Heavenly Kings (Cāturmahārājika).