The tilt of Earth's axis, toward the Sun at some times of the year and away from the Sun at other times, is responsible for the annual cycle of seasons.

地轴的倾斜在一年中的某些时候朝向太阳，而在其它时间远离太阳，造成了每年的季节循环。

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Which would explain why summer seems to zip by, except the seasons are a function of the tilt of the Earth's axis, not its different distances from the sun.

这不能解释为什么夏天似乎过的很快，因为季节是地球轴线倾斜的产物，与地球和太阳的距离无关。

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However, because Mercury has virtually no tilt to its axis, there are actually parts of the surface that never see sunlight at all.

FORBES: NASA Has Discovered Water Ice On Mercury

We have the seasons we currently do, due to the Earth's tilt at an angle of 23 degrees on its axis.

BBC: Why the Moon is getting further away from Earth