地球绕自转轴自西向东的转动。地球自转是地球的一种重要运动形式，自转的平均角速度为 7.292×10^（-5）弧度/秒，在地球赤道上的自转线速度为 466 米/秒。
该文研究了东北地区夏季温度与地球自转速度变化的关系。
The relationship between temperature of Northeast China in summer and the earth rotation speed is studied.
研究人员计算出这会怎样影响整个地球自转速度，这有助于保持角动量守恒。
The researchers calculated how this would affect the rotation rate of the whole planet, which would compensate to conserve angular momentum.
地球自转速度变慢、日长变长、华北地震活跃，据此认为目前华北处于非强震活动期；
When the speed of earth rotation is slowing, the length of day is lengthening, and the earthquakes in North China are active.
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