《黄帝内经·素问·六元正纪大论》
主运五步：初之运少角，二之运太徵，三之运少宫，四之运太商，终之运少羽。丙辰年、丙戌年，此二年均为天符。
太阳，太羽，太阴。丙辰天符，丙戌天符。
Main energy five steps: in the first step, the energy is the smallest; in the second step, the energy is too small; in the third step, the energy is less; in the fourth step, the energy is too much; in the fifth step, the energy is the smallest. Bingchen year and Bingxu year, these two years are all day charms.