apocenosis

例句：

1. 1. The apocenosis of the planet is calculated using mathematical models.
   使用数学模型计算行星的轨道。
2. 2.The spacecraft's apocenosis is crucial for its navigation system.
   航天器的位置对于其导航系统至关重要。
3. 3. The apocenosis of the comet is predicted to change significantly in the next few years.
   彗星的位置在未来几年将显著变化。