方窗中的十字不是原十字光源——移十字象检查法

The cross in square window is not original cross light source——Mobile cross checking method

用移十字象检查法 ,可确定分光计望远镜目镜视场中 ,原十字光源的位置 进而可以确认 :从望远镜的目镜进行观察 。

with the checking method of mobile cross image,the original position of cross light source can be made sure of in the field of the eye piece(ocular).So it is clear that the cross in the square window viewed from the eyepiece of telescope is not the original cross light source.