单词：perihelial
a. perihelion的变形
perihelion的用法和样例：
例句
用作名词(n.)
- A comet is at perihelion when it is closest to the sun.彗星最接近太阳时，它就是在近日点。
- The anomalistic year is the time between successive transits of the Earth through the perihelion.近点年是地球连续两次通过近日点之间的时间。
词汇搭配
- perihelion distance近日距
- advance of the perihelion近日点前移
【反义词】
- aphelion远核点