不认识认识

perihelion 英 [,perɪ'hiːlɪən] 　美 [,pɛrɪ'hilɪən]

设置

perihelion

n. [天] 近日点；最高点　

名词复数:perihelia　

A comet is at perihelion when it is closest (=very close) to the sun.　彗星最接近太阳时，它就是在近日点。

a slow evolution in the orbit of the planet Mercury (perihelion precession)　缓慢演变着的水星运行轨道（近日点的进动）；

1. A comet is at perihelion when it is closest (=very close) to the sun.

彗星最接近太阳时，它就是在近日点。
2. a slow evolution in the orbit of the planet Mercury (perihelion precession)

缓慢演变着的水星运行轨道（近日点的进动）；
3. 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。

perihelion (n.) "point at which a celestial body is nearest the Sun," 1680s, coined in Modern Latin (perihelium) by Kepler (1596) from Latinizations of Greek peri "near" (see peri-) + helios "sun" (from PIE root *sawel- "the sun"). Subsequently re-Greeked.

词频排名 noun:29436

感谢举报