The Earth is a planet in space.
地球是太空中的一颗行星。
It moves around the Sun in a path called an orbit.
它沿着一条叫做轨道的路径绕太阳运行。
This movement is called "revolution."
这种运动叫做“公转”。
The Earth takes one year to complete one orbit around the Sun.
地球绕太阳一周需要一年时间。
That is why we have 365 days in a year.
这就是为什么一年有 365 天。
The Sun does not move around the Earth.
太阳不会绕着地球转。
A long time ago, people thought the Sun moved around us.
很久以前，人们以为太阳围绕着地球转。
Now we know that the Earth moves around the Sun.
现在我们知道，是地球围绕太阳转动。
The Earth stays in its orbit because of gravity.
地球能够保持在轨道上，是因为引力的作用。
The Sun’s gravity pulls the Earth, just like a string holds a swinging ball.
太阳的引力拉着地球，就像一根绳子牵着一个旋转的球一样。
At the same time, the Earth moves forward in space.
与此同时，地球在太空中前进。
Gravity and motion work together to keep the Earth in orbit.
引力和运动共同作用，让地球保持在轨道上。
The Earth's orbit is not a perfect circle; it is slightly oval-shaped.
地球的轨道不是完美的圆形，而是略微椭圆形的。
Because of this, sometimes the Earth is a little closer to the Sun, and sometimes it is farther away.
因此，地球有时离太阳较近，有时离太阳较远。
The Earth's revolution around the Sun causes the four seasons.
地球绕太阳公转会带来四季变化。
When one part of Earth tilts toward the Sun, it is summer there.
当地球的一部分向太阳倾斜时，该地区是夏天。
When that part tilts away, it is winter.
当该部分远离太阳时，就是冬天。
Spring and autumn happen in between.
春天和秋天则发生在中间的过渡阶段。
Because of the Earth's orbit, we see different stars in the sky at different times of the year.
由于地球的轨道，我们在一年中不同的时间看到的星星也不同。
Now you know that the Earth orbits the Sun, and this movement affects our days, years, and seasons!
现在你知道地球绕太阳转，并且这种运动影响着我们的昼夜、一年时间和四季变化了！
