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.
它扁平的形状意味着土卫八曾经旋转得非常快，完成一次自转需要16个小时。
Its flattened shape implies that Iapetus once spun very quickly, completing a rotation in 16 hours.
火星自转一周的时间比地球长。
地球的自转提供了额外的推力。
岁差，基本上是地球自转轴方向的改变。
Precession, basically is the change in the direction of earth's axis of rotation.
许多行星不寻常的倾斜和自转暗示了这些过程的激烈程度。
How violent these processes were suggested by the odd tilt and spin of many of the planets.
月球的自转和倾斜在太阳系的其他行星体中是独一无二的。
The Moon's spin and tilt are unique among other planetary bodies in the solar system.
金星自转一周需要243个地球日，因此来自太阳的热量以更悠闲、更容易观察到的速度被吸收和分配。
The planet Venus takes 243 earth-days to turn once on its axis, so incoming heat from the sun is added and distributed at a more leisurely, observable pace.
地球既公转又自转。
素描按照火星的自转排成螺旋状。
Arranged in a spiral pattern, the sketches are positioned to follow the planet's rotation.
他写过很多与地球自转有关的科学文章。
He has written many scientific articles on subjects related to the Earth's rotation.
不便之处是地球的自转并不是那样的准确可靠。
The snag is that the rotation of the Earth is not so reliable.
答案就在月球自转。
RichardGross研究地球的自转。
但这种影响向外扩散，逐层改变地核的自转速度。
But the effect ripples outward, changing the core's rate of rotation layer by layer.
然而，气候变化也可能影响地球的自转。
现在，月球的自转速度与绕地球公转速度是一样的。
Right now, the Moon's rotation rate, and the time it takes to orbit Earth are the same.
他说：“这颗恒星自转速度相对来说比较快。”
该机构从全球各地收集地球自转的测量值，并取其平均数。
It collects and averages measurements of the Earth's rotation from around the world.
北极是地球表面与假想的自转轴相交的北交点。
The North Pole is the spot on Earth’s globe that marks the northern end of an imaginary stick Earth spins around.
高层大气中时隐时现的发光的云团可能跟太阳的自转有关。
THE comings and goings of noctilucent or "night shining" clouds in the extreme upper atmosphere may be linked to the sun's rotation.
月球自转一直变慢，直到相当于环绕地球一周所花费的时间。
Over time the Moon rotation slowed until it equaled the time it took the Moon to go around the Earth.
地震同样被认为致使地球自转轻微改变，缩短了一天的时间。
The quake is also thought to have changed the planet's rotation slightly and shortened Earth's day.
而且我们这个行星，就是地球还绕着自己的轴自转。
这称为自转换。
但是在所有这些地区，都将需要24小时时间去完成一周的自转。
Yet in all of those places, it still takes 24 hours to complete a single rotation.
但是在所有这些地区，都将需要24小时时间去完成一周的自转。
Yet in all of those places, it still takes 24 hours to complete a single rotation.
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