Celestialpoles are situated directly over the earth's geographical poles.
天极直接位于地球的地理极上面。
2
The sphere is mounted by its poles (corresponding to the celestialpoles) on a metal axis, and can rotate around it.
整个铜球可以绕一根金属轴转动,转动一周代表一个昼夜。
3
Then, as the sky darkened, the stars became visible, the Earth’s spin making them trace their own circular paths about the north and south celestialpoles.