近日点

例句：

1. 1. The planets move around the sun in a circle, with the aphelion and perihelion marking their closest and farthest points from the sun.
   行星围绕太阳移动，近日点和远日点标记它们离太阳最近和最远的位置。
2. 2. Astronomers use precise measurements to determine the aphelion of an exoplanet.
   天文学家使用精确的测量来确定一个外星行星的近日点。
3. 3. As we approach the aphelion of the planet, the distance from the sun increases.
   当我们接近行星的近日点时，与太阳的距离增加。