从国际空间站看到的地球 Earth as seen from the International Space Station (© JSC/NASA)

从国际空间站看到的地球 Earth as seen from the International Space Station (© JSC/NASA)

如此接近，却又如此遥远

地球的近日点 / 从国际空间站看地球

今天是地球的近日点，由于地球绕太阳公转的轨道是椭圆形的，所以冬至后两周，地球距离太阳最近。你可能有疑问：地球离太阳最近的时候，为什么我们没觉得更热？其实，这是因为近日点的时候地球所接受到的太阳辐射只比平时强了大约7%，这种微小的差异对地球天气的影响并不大。

Earth as seen from the International Space Station

We've reached perihelion! Two weeks after winter solstice the Earth's orbit is closer to the sun than at any other time of year—a result of the Earth's elliptical orbit. You may think, 'If we're so close to the sun, why can't I feel the heat?' Well, that's because we're only receiving about 7% more solar energy than normal, which doesn't really have much impact on the weather.