Ding is the third of the three directions of C, noon and D in the south, and it is called Invivo in celestial geomantic omen in the sky, which affects people's longevity. Legend has it that this is where the Antarctic fairy lives. Antarctic fairy Weng is a longevity. If there is water in this direction, it is called longevity water, which indicates that people living in this direction will live a long and healthy life. The water in this position, also called Wenchang Water, is the most suitable place for children to study hard and will exert a good force on their thinking. But if you see triangular buildings, such as iron towers, light poles and smoke windows, be careful! Will affect the marriage of young women. The ancient geomantic omen in China called the mountain or building in this position Widow Mountain, which indicated that the young women living here would lose their husbands.