你一开始先设置你的经纬仪（一个在校准的基座上旋转的望远镜），观测该物体。

You'd start by setting up your transit (a telescope that rotates on a calibrated base) and taking a sight on the object.

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本文对国产gdj型人卫跟踪经纬仪的观测结果进行了分析，讨论了几种误差来源并提出相应的改正方法。

In this paper the observed data with homemade GDJ tracking theodolite are analysed. Some causes of errors are discussed, and corresponding correcting methods for the errors are given.

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并以其中电子经纬仪虚拟照片法观测隧道周边位移为例，分析了系统的原理、使用方法及其精度。

Using electron theodolite dummy photograph observing tunnel border displacement, as the example, the authors analyse the principle, means and precision of the system.

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