《汉书·志·律历志下》
所以传说董因说： 君在辰时走，在参时进入，一定俘虏诸侯。 
故《传》曰董因云： 君以辰出，而以参人，必获诸侯。 
So the legend says Dong Yin said: If you leave during the Hour of the Dragon and enter during the Hour of the Dragon, you will surely conquer the feudal lords.