每年的二至点和二分点总会发生一些变化因为地球正改变着相对于绕日轨道面的自转轴角度。

From year to year, there is always some variability in the equinoxes and solstices because of the way Earth's changing tilt matches up with its orbit around the sun.

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日地系统的另一个特点是二分点和二至点沿轨道逐渐运动。

Another characteristic of the sun-earth system is the gradual procession of the equinoxes and solstices along the orbit.

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