地球在1月初接近太阳，而在7月远离太阳，尽管这种远近变化的影响比地轴倾角造成的冷暖效应要小得多。
Earth is a bit closer to the sun in early January and farther away in July, although this variation has a much smaller effect than the heating and cooling caused by the tilt of Earth's axis.
地轴的倾角也会周期性地变化，在22度到5度之间移动。
The inclination, or tilt, of Earth's axis also varies periodically, moving between 22 degrees and 5 degrees.
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