aphelion是什么意思 aphelion的用法 aphelion怎么读

aphelion

英 [æp'hiːlɪən]美 [æ'filɪən]

n. 远日点

ing-bottom: 40%;">

英语词源

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.