astronomical orientation

例句：

1. 1.The astronauts are studying the stars in space.
   宇航员们在太空中研究星星。
2. 2.The celestial bodies are moving around the sun.
   天体在绕太阳转动。
3. 3.Astronomers use telescopes to observe the night sky.
   天文学家使用望远镜来观察夜空。