1. four divisions (of the twenty-eight constellations 二十八宿 (èrshíbāxiù) of the sky into groups of seven mansions), namely: Azure Dragon 青龙 (Qīnglóng), White Tiger 白虎 (Báihǔ), Vermilion Bird 朱雀 (Zhūquè), Black Tortoise 玄武 (Xuánwǔ)