perihelion precession

例句：

1. 1. The perihelion precession of the planet Mercury is a fascinating topic in astronomy.
   水星的近日点进动是天文学中一个引人入胜的话题。
2. 2. The perihelion precession of the planet Mercury has been studied extensively by astronomers.
   水星的近日点进动已经被天文学家广泛研究。
3. 3.The perihelion precession of the planet Mercury is a crucial factor in determining its orbital period.
   水星的近日点进动是确定其轨道周期的关键因素。