当行星绕太阳运行时，其轨道椭圆的主轴每次都会改变。
The main axis of the planet's orbital ellipse shifts each time when it goes around the sun.
当地球的轨道更接近椭圆时，地球实际上在一年的一部分时间里更接近太阳。
When Earth's orbit is more elliptical, Earth is actually closer to the sun during part of the year.
地球轨道的一个特点是它的离心率，也就是轨道是椭圆而不是圆形的程度。
One characteristic of Earth's orbit is its eccentricity, the degree to which the orbit is an ellipse rather than a circle.
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.
地球沿椭圆形轨道运动。
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.
在太阳引力的控制下，每个行星都维持在一条椭圆形的轨道上，并按照相同的方向移动。
Under the control of the Sun's gravitational force, each planet maintains an elliptical orbit and all of them travel in the same direction.
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.
月球的轨道是椭圆的，因此，就意味着它不是以正圆的方式环绕地球公转，而是椭圆。
The Moon's orbit is elliptical, meaning it does not follow a circular but rather an oval path.
它每4.7天环绕恒星一周，其轨道为一个适度的椭圆，平均距离仅0.04个天文单位(为水星距太阳的十分之一)。
It orbits its star every 4.7 days, in a moderately elliptical orbit at a mean distance of only 0.04 AU (one tenth of Mercury's distance from the sun).
由于地球和木星的公转轨道是椭圆的，同时地球的轨道周期快于木星，从我们的角度观察，就像“追上”了这颗巨型气态行星。
Due to the near-circular orbits of Earth and Jupiter, as Earth has a faster orbital period than Jupiter, from our point of view we will appear to "overtake" the gas giant.
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.
我现在要进入一个椭圆形轨道，因为新的速度已经，不是圆形轨道中的速度。
I now go into an elliptical orbit because the new velocity is no longer the right velocity for a circular orbit.
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.
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.
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.
地球环绕太阳的公转轨道是偏心的，这是因为地球的公转轨道稍微呈椭圆形，所以这个轨道实际上就有两个中心（这两个中心都不与太阳的中心重合）。
The orbit of the earth around the sun is eccentric because the orbit is slightly elliptical and so has effectively has two centres (neither of them the centre of the sun).
第一条是，轨道是椭圆的-，太阳是中心。
And the first golden egg then - is that the orbits are ellipses — and the Sun is at one focus.
帕曲克能驾着650马力的beast绕着椭圆轨道跑上几个小时，他们把经过改装的civic开到100码也没有什么不可以。
Maybe young fans figured that if Danica Patrick can maneuver a 650 horsepower beast around an oval track for a few hours, they should be able push their modified Civic to 100 MPH.
12点方向，三明治移动。，LEWIN：，12：00，，there，goes，the，sandwich。,现在Peter决定在一个点,而不是把三明治向后扔，他也可以向前仍，因为，看，公色的椭圆轨道。
LEWIN Now, Peter decides at one point that instead of throwing the sandwich backwards, he can also throw the sandwich forward, because, look, we have here the red ellipse.
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.
如果这是一个围绕，地球的椭圆形轨道，那么这是近地点，这是远地点。
If this is an ellipse around the Earth, then this would be perigee and this would be apogee.
开普勒曾表明，地球的轨道是一个椭圆，这个椭圆有两个焦点，太阳在其中一个上。
As Kepler showed, the Earth's orbit is an ellipse, with the sun at one of the two focal points.
这颗星球每围太阳绕行一周，它的椭圆形轨道的中轴就变化一次。
The mainaxis of the planet's orbital ellipse shifts each time it goes round the sun.
太阳一年内的轨迹形成这种形状是因为地球围绕着与太阳略微不同的轴旋转，而我们的地球也沿着椭圆形轨道运行。
The sun makes this shape over a year because Earth rotates on a slightly different axis than the sun, and our planet also travels on an elliptical orbit.
这是因为月球环绕地球的轨道是卵形的或者椭圆形的。
This is because of the Moon's orbit around Earth which is oval or elliptical in shape.
有时候如果一个行星的轨道是拉长的或是椭圆的，那就有可能被当做轨道吻合的两颗行星。
Sometimes a single planet with an elongated, or elliptical orbit can look the same as two planets that trace perfect circles around their stars.
接着开普勒证明了这个椭圆轨道也能很有效解释其他行星的运行轨迹。然后他提出了行星运动定律，牛顿定律就是以此为理论基础的。
Kepler went on to show that an elliptical orbit is sufficient to explain the movement of the other planets and to devise the laws of planetary motion that Newton built on.
接着开普勒证明了这个椭圆轨道也能很有效解释其他行星的运行轨迹。然后他提出了行星运动定律，牛顿定律就是以此为理论基础的。
Kepler went on to show that an elliptical orbit is sufficient to explain the movement of the other planets and to devise the laws of planetary motion that Newton built on.
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