The Earth's axis of rotation is tilted in relation to the ecliptic plane, an imaginary surface through Earth's orbit around the sun.
地球的自转轴与黄道面呈一定角度。黄道面是地球公转轨道所在的一个假想平面。
It was a bit of a surprise, given that most solar observations show a pattern of about 28 days - the rotation rate of the surface of the sun.
这令人感到小小的惊讶，因为大多数太阳观测显示出一个以28天为周期的模式——这正是太阳表面的旋转周期。
The theorem shows some examples of this kind of W-minimal rotation surface we mentioned above.
该定理找到了我们所考虑的此类W-极小的旋转曲面的几个例子。
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