aphelion
英 [æp'hiːlɪən]
美[æ'filɪən]
- n. 远日点
英英释义
- 1. apoapsis in solar orbit; the point in the orbit of a planet or comet that is at the greatest distance from the sun
英文词源
- aphelion (n.)
- "point farthest from the sun" (of a celestial body's orbit), 1670s, a Grecianized form of Modern Latin aphelium, altered by Johannes Kepler based on Greek apo heliou "away from the sun," from apo "away from" (see apo-) + heliou, genitive of helios "sun" (see sol). The whole was formed on the model of Ptolemaic apogaeum (see apogee) to reflect the new helio-centric model of the universe.
词态变化
复数: aphelia;