公转轨道

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1.
Perhaps when this planet is at the far end of its path around the Sun, it reaches the inner edge of the Oort cloud.
当这颗行星运行到其公转轨道的远日点时，刚好就到达奥尔特彗星云的内缘。
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2.
The Earth's axis of rotation is tilted in relation to the ecliptic plane, an imaginary surface through Earth's orbit around the sun.
地球的自转轴与黄道面呈一定角度。黄道面是地球公转轨道所在的一个假想平面。
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3.
The planets do not travel about the Sun in circles, but in slightly lopsided, or egg-shaped, orbits called ellipses.
行星的绕日公转轨道并不是圆形，而是有些不对称、像蛋型的椭圆形轨道。
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4.
As a result, Uranus seems to be rolling on the orbital plane.
换句话说，天王星就好像是在公转轨道上滚动著。
www.lcsd.gov.hk
5.
Since the Earth's orbit is not circular, the orbital speed of the Earth is not constant.
由于地球公转轨道不是正圆形的，地球的公转速度也不是恒定的。
article.yeeyan.org
6.
And what a beast it is: as wide as Earth's orbit around the sun and 4. 3 million times more massive than our home star.
简直是个巨兽啊！宽度相当于地球公转轨道的直径，质量比我们的太阳还大430万倍。
article.yeeyan.org
7.
"That comes about because the Earth's orbit is not a true circle. We have a slightly elliptical orbit, " she said.
那是因为地球的公转轨道并不是一个正圆形，而是一个图圆形。
article.yeeyan.org
8.
This star also has a Jupiter-like planet that orbits every three years.
这颗恒星还有一颗类土星行星，每3年绕公转轨道来一圈。
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