the great circle representing the apparent annual path of the sun; the plane of the Earth's orbit around the sun; makes an angle of about 23 degrees with the equator;
"all of the planets rotate the sun in approximately the same ecliptic"
ecliptic的用法和樣例：
例句
用作名詞 (n.)
Five bright planets move among the stars near the ecliptic. 五顆明亮的行星在黃道附近的恆星當中移動.
The obliquity of the ecliptic is the fundamental cause of the seasons. 黃道的傾角是季節的基本成因。
用作形容詞 (adj.)
Several of the vectors lie surprisingly close to the ecliptic plane. 有些向量非常接近黃道面。
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