Because the stem of the solar column on Wuwu Day is Wu, and Wu belongs to the soil in the five elements, the eight characters and five characters on Wuwu Day are soil. In the five elements, fire produces soil, while soil produces gold, so Bing Ding in Rizhu Tiangan is born with you, while Japanese born in Wuwu is born with Geng Xin in Rizhu Tiangan. Mu Ke soil, but soil Ke water, so A and B in Rizhu Tiangan are like strangers in Wuwu, while Japanese strangers in Wuwu are like strangers in Rizhu Tiangan.