首楞嚴義疏注經 2.472

2.472

氣負日邊，如耳之有珥也。雄曰虹，雌曰蜺，即陰陽之精也。

Vapors bordering the sun, like ears having earrings. The masculine is called hóng, the feminine is called ní; they are the essences of yin and yang.