寻找彗星，通常是根据彗星的星历表用转换天球座标系的办法，即将第一赤道座标系（α、七）转换为地平座标系（A、h）去找到它。
In cider to find the comet , the usual way is to chang the celestial coordinate system according to the ephemeris of the comet , that is , to chang the first celestial equatorial coordinate system into the horizontal coordinate system .
彗星表