目标是测量AU；随后，当我们知道了所有围绕太阳的其他行星的轨道速度，对太阳系的规模就有充分的认识了。
The goal was to measure the AU; then, knowing the orbital speeds of all the other planets around the Sun, the scale of the Solar System would fall into place.
在太阳系所有行星中，火星绕太阳的轨道速度第四快。
Mars's orbit around the Sun is the fourth fastest orbit of all the solar system planets.
其轨道速度一定是在每秒几百米。
开普勒第二定律指行星的轨道速度与其和太阳的距离。
Kepler's second law means that a planet's orbital speed changes with its distance from the sun.
如果想要逃离这里，你将需要一个速度，是轨道速度2倍大的，平方根。
If you want to escape from this, you will need a speed which is the square root of two times larger than that orbital velocity.
也许你会说，这是，完全没有意义的,它等于1/2m地,轨道速度的平方。
Well, that's completely trivial, you would say, because it is one-half * of the mass of the Earth times the orbital speed squared.
地球的轨道速度，称之为轨道,物体的角速度，它按照一定的,角度速度旋转。
The Earth has an orbital velocity, v I call it v orbital, and there is on the object the angular velocity, It goes around with a certain angular velocity.
现在注意我能,代替这个v平方，我能代入这个平方,那是轨道速度,然后得到MG在R上。
But now notice, I can substitute now for this v squared, I can substitute the square of this that is the orbital speed and then I get M G over R.
螺旋星系中的轨道速度并不会随著离开星系中心的距离增加而不停降低，它会平缓下来成为一固定值。
Orbital velocities in spiral galaxies, instead of declining with increasing distance from the galactic center, flatten out to a constant value, as predicted by MOND.
在这个方案中，一个载物飞行器(比如说搭载着卫星)将(首先)搭载超燃冲压发动机进入相当高度，理论上能够达到近似轨道速度。
In such a scheme, a payload vehicle (holding, say, a satellite) would piggyback to high altitude aboard the scramjet, which in theory could reach near-orbital speeds.
这种方法可直接获得向径、轨道速度等参数随时间或极角（绕地心的转动角）的变化，便于分析轨道转移与逃逸运动，有助于飞行使命与运动轨迹的设计。
Radius and orbital velocities can be directly expressed as functions of time or polar angle, which is helpful for designing flight mission and motion trajectory.
它们是轨道的半径，系统的能量以及电子的速度，我接下来给你们展示解法。
They are the radius of the orbit, the energy of the system and the velocity of the electron, and I am just going to present you the solutions.
地球引力减缓了月球的自转速度，使之与其轨道的速度相匹配。
The earth's gravity slows the moon's rotation, matching it to the speed of its orbit.
它在轨道上运行的速度能达到每小时50公里。
意思是三明治不动，在轨道中没有速度。
That the sandwich stands still, has no speed in orbit anymore.
同样的，第五个方程序，中的速度同样，会随时间改变，因为这是椭圆形轨道。
Also that velocity, v, in that equation number five will also change with time because it's an elliptical orbit.
通过本《战略》目标，联邦铁路局建议对与轨道客运服务相关的最大运营速度，以及上述其他因素予以分门别类的定义。
Through this strategy, FRA proposes to define categories or "tiers" of rail passenger service tied to maximum operating speeds and the aforementioned factors.
巨大的太空岩石以每小时11 000英里——五倍于步枪的速度在火星和木星轨道间相撞，形成壮观的碎片尾迹。
The giant space rocks created a spectacular trail of debris as they collided at 11, 000mph - five times the speed of a rifle bullet - between the orbits of Mars and Jupiter.
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.
航天器的重量和轨道不同，所需火箭提供的能量和速度也各不相同，各种轨道与速度之间有一定的对应关系。
And the weight of the spacecraft orbit, the rocket needed to provide energy and speed varies, with a variety of track between the speed of a certain relationship.
如果知道R，就能，计算轨道里的速度。
所以从原则上来说，你们可以决定任何,恒星在轨道中的速度，轨道的半径以及，当然，二元体系的周期。
So, in principle, you can determine for each one of those stars the velocity in orbit, the radius of their orbit and, of course, the period of the binary system.
他说，上海将轨道交通的速度限制在每小时45千米(合每小时28英里)，并且将成立委员会调查此事件。
Shanghai is limiting train speed to 45 kilometers an hour (28 miles per hour), and will form a committee to investigate the accident, he said.
然后是轨道上的速度,然后是半径。
Out of that pops its velocity in orbit and out of it pops its radius.
径向速度法，即观察某颗行星环绕恒星的轨道所引起的恒星相对地球来往的速度变化。
The radial velocity method, which looks for changes in a star's velocity toward or away from Earth triggered by a planet's orbit around that star.
更进一步说，任何高铁的运转都需要轨道区段，而这些区段只能承受常规速度的运行。
Further, any HSR operation will include track segments where only conventional speeds are possible.
没有这六次“飞经”（利用各行星重力场的作用），就没办法使信使号降到能滑进水星轨道的速度。
Without its six fly-bys—which used the gravitational fields of the planets involved to counter that effect—Messenger could not have slowed sufficiently to allow it to drop into its intended orbit.
表面重力，这个气体巨人的大气层的气压水平限制在一巴范围，是地球的百分之90的并且需要达到的低轨道的速度是所有的气体行星的最低水平。
The surface gravity, which is defined from the 1 bar pressure level in a gas giant's atmosphere, is 90 percent that of Earth's and the speed needed to reach low orbit is lowest of all the gas planets.
我之前说过，注意，轨道时间和逃逸速度，因2的平方根不同，如果你在某特定位置。
I mentioned earlier, notice that the orbital period and the escape velocity vary by a square root of two if you are at a particular position.
这次15分钟的亚轨道飞行达到了海拔116英里的高度，最大速度为每小时5134英里。
The 15 minute sub-orbital flight achieved an altitude of 116 miles and a maximum speed of 5, 134 miles per hour.
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