apoapsis in solar orbit; the point in the orbit of a planet or comet that is at the greatest distance from the sun
例句
用作名词 (n.)
Otherwise difficult to notice, the change in the Sun's apparent diameter between Perihelion and Aphelion is clear. 我们很难用肉眼看出近日点和远日点太阳视直径的变化，但在这张图上显而易见。
美
[æ'fiːlɪən]
