Well the earth is rotating while simultaneously revolving around the sun.

其实地球在自的同时也绕太阳公。

And it has what we call " retrograde rotation" .

我们称其为逆向自。

The planet's rotation rate has something to do with it.

星自的速度有关。

It takes 243 Earth days for Venus to complete one full rotation.

金星自一圈需要243个地球日。

The speed of this rotation is what defines a day.

自的速度决定了一天的长度。

What is the fastest spinning planet in our solar system?

太阳系中自最快的星是？

Or maybe it had trouble keeping up with the ground spinning beneath it?

或者可能是它没能跟上地球的自？

When the Earth spins on its axis, ocean levels stay the same.

当地球自时，海平面保持不变。

One turn on the Earth's axis takes 24 hours — that's what makes one day.

地球自一周，需要24小时也就是一天。

Jupiter spins much faster than Earth.

木星的自速度比地球都快。

Over long time scales, Earth's rotation is actually slowing down.

从长期来看，地球的自实际上正在减慢。

We can see it more often than that because of how fast the Earth rotates.

我们经常能看到月亮，是因为地球自速度快。

Some spin with periods many seconds or even minutes long.

它们有些自的周期仅有几秒甚至几钟。

We forgot to put the rotation of the Earth into the equation.

我们忘了在方程式中加入地球自了。

So it spins backwards compared to the direction of spin of all the other planets.

因为自的方向不同于太阳系中所有其他星。

That means they orbit in the opposite direction that the planet spins in.

意味着它们的轨道方向与星自的方向相反。

The massive precursors to neutron stars often spin.

中子星的大质量前驱体经常保持自。

You see, Earth's spin on its axis gradually slows down over time.

你看，地球沿地轴自的速度随时间而逐渐减慢。

At the Equator, Earth spins at a speed of 1670 kilometers per hour.

在赤道，地球以每小时 1670 公里的速度自。

The farther away you get from the Equator, the slower the spin you experience.

你离赤道越远，你的自速度就越慢。