《周礼·春官宗伯·大卜&诅祝》
占梦掌管每年四季观察日月的交会，辨别阴阳之气。
占梦掌其岁时观天地之会，辨阴阳之气。
The dream master is in charge of observing the intersection of the sun and the moon every season of the year to distinguish between yin and yang.