八分仪

例句：

1. 1. The astronomers used an astrolabe to measure the position of the stars.
   天文学家们使用一个八分仪来测量星星的位置。
2. 2. The astronaut was using a telescope to observe the planet Mars.
   宇航员正在使用望远镜观察火星。
3. 3. The astronomy club has been gathering data for their upcoming stargazing event.
   天文俱乐部一直在收集数据，为他们的即将到来的观星活动做准备。