As far as choosing a day is concerned, sitting on the purple mountain will be hedged by the meridian. If you choose to build a funeral day, you will use noon and noon, which is the three evil spirits, also called rushing mountains; Second, in terms of shape, there is water coming straight from the back of the mountain, which is called rushing to the mountain; Third, water comes directly from the face, which is called rushing through the heart. All three are not good.