《宋史·列传·卷一百九十九》
柳开对他的从事说 ：我看到昴宿有光，天上的云都从北面来侵犯我们的境界，这些象征，说明敌人将要来了。
开谓其从子曰： 吾观昂宿有光，云多从北来犯境上，寇将至矣。
Liu Kai said to his assistants: “I saw light on the Subaru and the clouds from the north are invading our border. These are the symbols of the enemies’ attacking.”