Discussion on Some Methods for Observing Asteroids

In this article the advantages and disadvantages of the determination of the corrections for the zero points of a catalog by means of the observations of asteroids are presented and some results obtained by the meridian and photographic methods are also given. The sources of error of the observation methods, especially the greater difference between the result of the determination of the correction for the zero point by using the observations of an asteroid and that by using the observations of a major planet, which is caused by the imperfect kinetic theory of asteroids, are also discussed in this paper.