彗星在圆形轨道上形成，但当它们冒险太接近行星时，就会被引力抛入现在的椭圆轨道。
Comets formed in circular orbits but were gravitationally flung into their present-day elliptical orbits when they ventured too close to planets.
天文学家怀疑成对的行星也参与了这种弹弓活动，使它们处于不规则的椭圆轨道上。
Astronomers suspect that pairs of planets also engage in this slingshot activity, leaving them in disturbed, elliptical orbits.
我们在之后的课程还会讲到椭圆轨道，不过现在我们只讲，圆轨道。
Later in the course, we will cover elliptical orbits, but now let's exclusively talk about circular orbits.
第三定律是，椭圆轨道的周期，和距太阳的平均，距离的，立方成比例。
And then his third law was that if you take the orbital period of an ellipse, that is proportional to the third power of the mean distance to the Sun.
本文给出在非共面椭圆轨道上运行的航天器的伴随运动方程。
This paper presents some equations of adjoint motion for spacecrafts moving in elliptic orbit of different plane.
现在从我给出，初始条件的，四个数值中，知道了关于，椭圆轨道的一切。
So now we know everything there is to be known about this ellipse, and that came from the initial conditions from the four Numbers that I gave you.
现在，我想和大家一起复习，在黑板上关于，椭圆轨道的知识。
And now I want to review with you what I have there on the blackboard about ellipses.
提出了一种基于椭圆轨道的星载sar面目标原始数据模拟的方法。
A method of area target's raw data simulation of spaceborne SAR based on elliptical orbit is presented.
望远镜能搜寻类似于冥神星那样以偏离太阳系的椭圆轨道平面绕太阳运行的矮星。
The telescope can be used to search for dwarf planets like Pluto that orbit the Sun off the solar system's ecliptic plane.
开普勒第一定律，也称椭圆定律，指出每一个行星沿椭圆轨道围绕太阳。
The first law, sometimes called the law of orbits, states that planets orbit the sun elliptically.
提出了一种用静止卫星和同步椭圆轨道卫星构造的区域卫星定位系统。
A regional satellite navigation system which is made up of geosynchronous satellites and synchronous satellites with elliptical orbit is proposed.
采用该控制方法，进行大椭圆轨道慢旋目标同步绕飞跟踪控制器设计。
The proposed method is applied to slowly rotating non-cooperative target in an arbitrary elliptical orbit synchronous fly-around position tracking control.
讨论了平面情况时两个共焦的椭圆轨道之间的最佳单冲击过渡及其意义。
This paper studies the best one impulse transfer between two coplanar and confocal elliptic trajectories and its application.
这些行星都以太阳为中心以椭圆轨道公转，虽然除了水星的十分接近于圆。
These planets all take sun as center by elliptical orbit revolution, although extremely approaches except Mercury to the circle.
但是如果日食出现在月球处于它的椭圆轨道远地点的时候，它显得比太阳小而无法完全遮盖住太阳。
However, if an eclipse occurs while the Moon is on the far side of its elliptical orbit, it appears smaller than the Sun and can't completely cover it.
沿着圆形轨道运行的，时间和沿着椭圆轨道，所花费的时间是一样的，这决非显而易见的。
So to go around this circular orbit will take the same amount of time as to go around this one, and that is by no means obvious.
有时，冥王星的高椭圆轨道内的传递海王星，使海王星离太阳最远的行星，在这些时间。
Occasionally, Pluto's highly elliptic orbit passes inside that of Neptune, making Neptune the furthest planet from the sun during these times.
利用平方反比引力给出的关系式和索末菲量子化条件推导出类氢原子的椭圆轨道和能量。
The energy and the elliptical orbit of the electron in hydrogen-like atom are derived from formula inverse square attraction and Sommerfeld's quantized conditions.
仿真结果表明，在椭圆轨道的编队维持控制器中引入部分干扰内模可大幅度提高维持精度。
Numerical simulations show that the proposed controller containing some disturbance internal models can improve the formation maintaining accuracy a lot for the elliptical orbit.
阐述了临界倾角太阳同步回归轨道这种特殊椭圆轨道的设计方法，总结了其轨道要素的计算步骤。
The method of designing special elliptic orbit which was critical inclined, sun synchronous and repeating ground trace was expounded, and the calculation process of this method was summarized.
这意味着，即使这个星球有类似地球的卫星，它们也不可能承受得了天苑四b椭圆轨道带来的极端温度变化。
That means that, even if the planet has terrestrial moons, they likely wouldn't be able to stand the extreme temperature swings that go along with Epsilon Eridani b's eccentric orbit.
第三定律（周期定律）：各个行星绕太阳公转周期的平方和它们的椭圆轨道的半长轴的立方成正比。
The square of the orbital period of a planet is directly proportional to the cube of the semi-major axis of its orbit.
“要是你觉得仍人们遵守交通法规困难的话，”书中写道：“试想一下让小行星沿着椭圆轨道运行。”
“If you think it is hard to get humans to follow traffic laws,” we read, “imagine convincing an asteroid to move along an ellipse.”
与现有一些结果相比，这里提出的方法计算简单，而且适用于一般共面椭圆轨道情况，并保证全局最优性。
Comparedwith the existing results, this method is simpler in computation and valid for the case of elliptical orbits with global optimality guaranteed.
现在，牛顿理论认为，有一些彗星沿双曲线或抛物线运行，永远不再返回；另外一些彗星沿普通的椭圆轨道运行。
Now according to Newtonian theory, some of them moved in hyperbolas or parabolas never to return; others moved in ordinary ellipses.
现在，牛顿理论认为，有一些彗星沿双曲线或抛物线运行，永远不再返回；另外一些彗星沿普通的椭圆轨道运行。
Now according to Newtonian theory, some of them moved in hyperbolas or parabolas never to return; others moved in ordinary ellipses.
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