First, I use a steel ball (around 2 to 4mm) set up outside in the sun about 80 feet from the scope. Use the sun's reflection on the ball as a star.

首先，我用一个钢株，大约2- 4毫米，放在80英尺远的户外太阳底下，用太阳反射光作星点。

youdao

First, I use a steel ball (around 2 to 4mm) set up outside in the sun about 80 feet from the scope. Use the sun's reflection on the ball as a star.

首先，我用一个钢株，大约2- 4毫米，放在80英尺远的户外太阳底下，用太阳反射光作星点。

youdao