perihelion
发音
英 [ˌperɪ'hi:lɪən]
美 [ˌperɪ'hilɪrn]
-
- n.
- 近日点
单词词源
双语例句
- 1. How much does the direction of perihelion change each orbit ?
- 近日点方向使每个轨道改变了多少？
- 2. According to marsden 's calculations , this comet reaches its closest point to the sun ( perihelion ) on march 18th .
- 根据marsden的计算，这颗彗星会在3月18日过近日点。
- 3. Although predicting the brightness of comets with any degree of accuracy is very difficult , hale-bopp met or exceeded most predictions when it passed perihelion on april 1 , 1997 . The comet was dubbed the great comet of 1997 .
- 虽然预测彗星在不同角度的亮度是非常困难的，但是当1997年4月1日海尔波普彗星通过近日点时，达到甚至超过了大多数的预测。